Yes, it is correct. The results may be considered reliable if the chance of an outcome due to chance is less than 5%.
What do you mean by experiments?
Experiment is a method of testing a hypothesis or theory by observing the results of an action under controlled conditions. Experiments help scientists to learn how certain variables interact and influence one another, and can be used to test theories and develop new ideas.
However, it is important to note that there are other factors to consider when assessing the reliability of results, such as the accuracy of the measurements and the quality of the data.
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The graph shows how the force component F cos θ along the displacement varies with the magnitude s of the displacement. Find the work done by the force. The graph plots F cosine of theta versus s. At s equals zero the graph is at zero and then rises linearly to the value 62 newtons. It then descends linearly to zero forming a shaded triangle of base 1.6 meters.
The work done by the force is 49.6 J.
The complete question is in the attachment. The formula to calculate work done
W = F × d × cos α
F = force (Newton) d = displacement (m) α = the angle between the force and the displacementWhen the condition
Forces that work in an object F = F cos θThe area under the curve in the force against displacement graph shows the work done.
W = Area of triangle
W = (b × h) ÷ 2
W = (b × h) ÷ 2
W = (62.0 × 1.60) ÷ 2
W = 99.2 ÷ 2
W = 49.6 Joule
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A baseball pitcher throws a baseball with a speed of 36 m/s . In throwing the baseball, the pitcher accelerates the ball through a displacement of about 3.5 m, from behind the body to the point where it is released as shown in (Figure 1) . Estimate the average acceleration of the ball during the throwing motion. Express your answer using two significant figures.
The time taken to accelerate the ball up to 3.5 m is 0.097. Then the acceleration of the ball will be 740 m/s².
What is acceleration ?The acceleration of a moving body is the rate of change in its velocity. It is a vector quantity having magnitude and direction.
Given that, speed v = 36 m/s
displacement s = 3.5 m
time = distance/speed
t = 3.5 m/ 36 m/s = 0.097 s.
then s = ut + 1/2 at²
initial velocity u = 0
then 3.5 m = 1/2 at²
a = 2 × 3.5 m/(0.097 s)²
= 740 m/s²
Therefor, the acceleration of the baseball is 740 m/s².
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1- Find one number to represent each car’s speeding up (acceleration). Do not change units in this activity!
Each car drips oil once every second (think sugar packets).
The speedometer measures the speed of the car when the oil drips.
Larger numbers should be cars that speed up faster
2- Some cars have the same number of acceleration as another one. Which are they?
The cars that have the same number of acceleration as another one are C and E.
What are the cars with the same acceleration?
The cars with the same acceleration must have equal change in speed with direction.
The resultant velocity of the cars or the resultant speed of the cars in a given direction is calculated as follows;
change in speed of car A = 45 mph - 5 mph = 40 mph
change in speed of car B = 15 mph - 0 mph = 15 mph
change in speed of car C = 50 mph - 5 mph = 45 mph
change in speed of car D = 34 mph - 4 mph = 30 mph
change in speed of car E = 57 mph - 12 mph = 45 mph
Thus, the two cars that are changing their speed in a particular direction at equal rates are C and E.
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An engineer designing a system to control a router for a machining process modelima the system so that the router's acceleration (in /s2) during an interval of time is given by a = -0.4v, where v is the velocity of the router in in/s. When t=0, the position is so and the velocity is v2 in/s. What is the position at t-3 s? (10 points)
The position at t=3s is determined by the initial velocity and the equation above.
The integrating factor is defined as the function chosen to solve the given differential equation. It is most typically employed in first-order ordinary linear differential equations.
Where P(x) indicates the function of x and signifies the integrating factor.
To find the position of the router at t=3s,
we need to solve for the velocity and position at t=3s.
Starting with velocity, we have:
dv/dt = -0.4v
This is a first-order linear differential equation, which can be solved using an integrating factor method:
[tex]v = v2e^{(-0.4t)}[/tex]
Next, we integrate this to find the position:
dx/dt = v
[tex]x = v2 / 0.4 \times (1 - e^{(-0.4t)})[/tex]
Plugging in t=3 and the initial velocity, v2, we get:
x = [tex]v2 / 0.4 \times (1 - e^{(-0.4 \times 3)})[/tex]
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An airplane has an air speed of 120.2 m/s and flies due north, but the wind blows from the northeast to the southwest at 48.5 m/s. What is the plane’s actual ground speed?
The northeast to the southwest at 48.5 m/s ,The plane’s actual ground speed is 124 m / s.
What is the plane’s actual ground speed?An airplane has an air speed of 120.2 m/s, the southwest at 48.5 m/s.
The hypotenuse of a right triangle is created by multiplying the plane's north direction, which is perpendicular to the wind's direction of force, by these two vectors.
Pythagorean theorem is used to determine the velocity vector's magnitude: V V2 = V 2 p l a n e + V 2 w I n d
V 2 P G = ( 120 ) 2 + ( 48.5 )2 V P G ≈ 124 m / s
The northeast to the southwest at 48.5 m/s ,The plane’s actual ground speed is 124 m / s.
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Describe an experiment to determine the frequency, amplitude and period of a flywheel in motion.
Answer:
To determine the moment of inertia of a flywheel we will have to consider a few important factors. First, we have to set up a flywheel along with apparatus like a weight hanger, slotted weights, metre scale and we can even keep a stopwatch.
Then we make some assumptions.
We will take the mass as (m) for the weight hanger as well as the hanging ring. The height will be (h). Now we consider an instance where the mass will descend to a new height.
Suppose Gabor, a scuba diver, is at a depth of 15m
. Assume that:
The air pressure in his air tract is the same as the net water pressure at this depth. This prevents water from coming in through his nose.
The temperature of the air is constant (body temperature).
The air acts as an ideal gas.
Salt water has an average density of around 1.03 g/cm3
, which translates to an increase in pressure of 1.00 atm
for every 10.0 m
of depth below the surface. Therefore, for example, at 10.0 m
, the net pressure is 2.00 atm
.
What is the ratio of the molar concentration of gases in Gabor's lungs at the depth of 15 meters to that at the surface?
The molar concentration refers to nV
, i.e., the number of moles per unit volume. So you are asked to calculate (n/V)15m(n/V)surface
What type of expansion does the air in the "freediver's" (no gear) lungs undergo as the diver ascends?
the ratio of the molar concentration of gasses in Gabor's lungs to that at the surface is 3.00 : 1.00 atm and the type of expansion, isothermal expansion.
What is the molar concentration?At a depth of 15 meters, the net pressure is 3.00 atm (1.00 atm for every 10.0 m of depth below the surface). Since the air pressure in Gabor's air tract is the same as the net water pressure at this depth, the pressure of air in his lungs is 3.00 atm.
The molar concentration of a gas is proportional to its pressure and inversely proportional to its temperature and volume. Since the temperature is constant, the ratio of the molar concentration of gases in Gabor's lungs at the depth of 15 meters to that at the surface is given by:
(n/V)15m/(n/V)surface = (P15m/Psurface) = (3.00 atm/1.00 atm) = 3.00atm.
As the diver ascends, the air pressure in his lungs decreases, causing the air to expand. This is an example of an isothermal expansion.
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Does a communications or weather satellite that is orbiting Earth follow Kepler's laws? Kepler's Laws of Motion These laws are true for any orbit: a planet orbiting a star, a moon orbiting a planet, or an artificial satellite orbiting the Earth.
Yes, a communication or weather satellite that is orbiting Earth follows Kepler's laws. Kepler's laws describe the motion of objects in orbit around a central body, such as a planet or a star.
These laws are based on the principles of gravity and the conservation of energy, and they describe the elliptical shape of an object's orbit, the relationship between the size of the orbit and the time it takes to complete one revolution, and the relationship between an object's distance from the central body and its orbital velocity.
Since a communication or weather satellite orbiting the Earth is subject to the laws of gravity, it follows Kepler's laws, just like any other object in orbit around a central body. This means that its orbit is elliptical, its orbital velocity changes based on its distance from the Earth, and it follows the other principles described by Kepler's laws.
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How do I solve this 625=1/2(8)(x)^2 ?
The value X is equal to 1/100 or -1/100
How to solve rational equations?
Any equation with at least one rational expression is referred to as a rational equation. The same operations are applied to both sides of the equation to solve rational equations in the same way that algebraic equations are, until the variable is isolated on one side of the equals sign.Rational Equation Solver. A rational equation is a particular kind of equation that contains at least one rational expression, which is just another way of saying a fraction.The ideal method for solving this kind of equation is to use the LCD principle to get rid of all the denominators (least common denominator).625 = 1/2(8)(x)^2
simplifying the equation,
625= 1/16x^2
multiply both sides by x^2
625x^2=(1/16x^2)x^2
simplify equation
625x^2=1/16
solve 625x^2=1/16, we get
x=1/100 or x=-1/100
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Pressure Problems The pictured U-tube is with the mercury open to the atmosphere at both ends. Assume that the mystery fluid does not mix with the Mercury (a) Let po represent atmospheric pressure, phg represent the density of mercury, and pi represent the density of the mystery fluid. Obtain an algebraic expression for the density of the mystery fluid in terms of some or all of the following: hi, ha, hs, and pe (b) For the situation shown in the figure, which is true, pr Phe Or Prhe Explain. If hi- 2.55 cm and h2 25.00 cm (clearly the figure is not to scale), then what is the most likely identity of the mystery fluid? On what scientific evidence did you base your choice? (c) Page 11 of 276 (d) If the absolute pressure at Point A is 114,200 Pa, what is the height hs? Use the nume from Part (c). Using previous numerical values, determine the gauge pressure at Point A. Take atmospheric pressure to be po 101,300 Pa. (e)
(a) The density of the mystery fluid, ρi, is given by the equation ρi = (h2 - h1) * ρHg. (b) In this situation, pρHg > pρi is true. This is because the density of mercury is greater than the density of the mystery fluid, so the pressure of the mercury is greater. The most likely identity of the mystery fluid is air, as this is the most common fluid found in the atmosphere. (c) The absolute pressure at Point A is calculated using the equation po + pρHg * h2 + pρi * hi. (d) Using the numerical values given, the height hs is calculated to be 2.55 cm. The gauge pressure at Point A can then be calculated to be 114,200 Pa - 101,300 Pa = 12,900 Pa. (e)
9) water stored in a dam is potential energy-
this is a give reason give me answer
Potential energy is the energy that an object has as a result of its position. Water contained in a dam has potential energy because it is elevated above the surrounding terrain.
Explain about the potential energy?An object's position-based energy is referred to as potential energy. As a result of being higher off the ground than other water storage areas, dam water has potential energy.
Water would flow downriver if there were no dams. The dam, however, restricts the water's flow and collects it there instead. The water now stands higher than the ground in relation to it. The water will possess stored potential energy because it is elevated above the earth.
The position of a rock on a cliff's brink. The rock will be moving if it falls, which will cause the potential energy to be transformed into kinetic energy. a longbow with a stretched-out elastic string.
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100 POINTS, MULTIPLE QUESTIONS, NEED HELP ASAP
1. Does increasing the force affect the amount of work done climbing the stairs? Does increasing the distance affect the amount of work done climbing the stairs? How would you describe the mathematical relationship between these two parameters? Explain your answer using your data and graphs.
2. Does increasing the work affect the amount of power generated climbing the stairs? Does walking up the stairs faster affect the power generated? Explain your answer using your data and graphs. How would you describe the mathematical relationship between these two parameters? Notice the relationship when work is constant or when only time is constant.
3. Another student says that “For this experiment, the person with the most mass does the most work and has the most power.” How would you try to prove or disprove this conclusion using your data? Do you think that the student is correct? Why or why not?
4. Would the work that you do in walking up your flight of stairs differ in any of the following situations?
• Running up your flight of stairs
• Climbing a wall of an identical height to your stairs
• Walking up a long ramp to a height identical to your stairs
Explain your answer based on what you know about work, forces, and power.
I hope this helps, and drop me a crown if you feel like I deserve it please
The constellation whose stars are used as pointers to the north celestial pole in the northern hemisphere at this time in history is:______
The constellation whose stars are used as pointers to the north celestial pole in the Northern Hemisphere at this time in history is Ursa Minor.
Polaris is known as the North Star, which is located in the constellation Ursa Minor. The star doesn't sit directly on the Earth’s north celestial pole, but it is very close. Using the Little Dipper as a reference, Polaris is easy to identify in the Northern Hemisphere. The stars, including the constellations, in the night sky appear to rotate around Polaris throughout the year.
Ursa Minor (or the Little Bear) is a constellation that is located in the far northern sky. This constellation was one of the 48 constellations that was listed by Ptolemy, and it remains one of the 88 modern constellations. Traditionally, Ursa Minor has been important for navigation because of Polaris being the north pole star.
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once the distance to a remote object is determined via triangulation, one can measure the angular diameter of the object and convert that to an actual diameter. for relatively small angular diameters of a few degrees or less, the corresponding linear diameter can be approximated using the following expression: diameter (57.3 degrees).
Consider the Moon and Sun. Their angular diameters are both equal to about .5 degree. If the Sun is roughly 400 times more distant than the Moon, how much bigger is the Sun's diameter than the Moon's?
The Sun's diameter is approximately 200 times greater than the Moon's.
The angular diameter of an object is proportional to its physical diameter and inversely proportional to its distance from the observer. Thus, we can write the following relationship:
Actual diameter = Angular diameter × distance
For the Moon, with an angular diameter of 0.5 degrees, we can write:
Diameter of the moon = 0.5 degrees × distance of the moon
And for the Sun, with an angular diameter of 0.5 degrees and a distance that is roughly 400 times greater than the Moon's:
Diameter of the Sun = 0.5 degrees × distance of Sun = 0.5 degrees × 400 distance of the Moon = 200 × diameter of the Moon
Therefore, the Sun's diameter is approximately 200 times greater than the Moon's.
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(psychology question)
What is decay?
Decay is the quantity that can be stored.
Decay is a measure of time.
Decay is a measure of the quality of memories.
Decay is to diminish or break down.
Answer:
Decay is a measure of the quality of memories.
Explanation:
That is just a definition of decay theory for Psychology
Answer:
Decay is to diminish or break down.
Explanation:
took test
What is the magnitude and direction of the electric field intensity when the distance of a point charge from the center of a dipole is very large as compared to the length of the dipole?
To calculate electric field created by a dipole on the axial line, magnitude and direction of the electric field intensity when the distance of a point charge from the center .
All the measurement of distances are to be taken from the centre(O).
Let the distance between O to +q and O to –q be ‘l’. So, total length between +q and –q will be ‘2l’.
Take a point ‘p’ on the axial line at the distance ‘r’ from the center as shown in figure.
Electric field on the axial line of dipole is not 0
magnitude =E = 14πε0 2Pr2
An electric field is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them.
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For a wire extended elastically, the elastic energy per unit volume X is given by
X=Ce^2E
where C is a constant,
e is the strain of the wire,
and E is the Young modulus of the wire.
Show that C has no units.
C's units must be dimensionless in order for the equation's units to be consistent, C doesn't have any.
What is elastic energy?When a force is applied to an object, it deforms, storing energy that is released when the force is removed. This energy is known as elastic energy. The inclination of the thing to assume its original shape results in this energy.
This is the case because C's units cancel out with the other variables' units in the equation.
The fractional change in the wire's length is represented by the strain, or e, which has no dimensions. The units of the Young modulus, E, are Newtons per square metre. The units of force and area cancel out when we square the strain and multiply it by the Young modulus, leaving only units of energy per unit volume.
For the units to cancel out appropriately in the equation X=Ce2E, the units of energy per unit volume are commonly written as joules per cubic metre (J/m3). Therefore, C, as a proportionality constant, must have no units.
Therefore, C has no units since C's units must be dimensionless for the equation to have consistent units.
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hearing rattles from a snake, you make two rapid displacements of magnitude 1.8 m and 2.4 m . choose the sketch (drawn roughly to scale) that shows how your two displacements might add up to give a resultant of magnitude: 4.2 m 0.60 m 3.0 m drag the appropriate labels to their respective targets. not all labels will be used.
The displacement must be in same, opposite and perpendicular directions to get the net displacements as 4.2 m, 0.6 m and 3.0 m.
The two displacements are, 1.8 m and 2.4 m.
Since 1.8 m + 2.4 m = 4.2 m.
The displacements must be aligned in the same direction.
For the second case, where net displacement should be 0.6 m.
Since 2.4 m - 1.8 m = 0.6 m,
In this case the displacements must be in opposite directions.
For net displacement 3.0 m, the two displacements must be perpendicular to each other since,
[tex]\sqrt{{1.8}^2+{2.4}^2} = 3.0[/tex]
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What best describes a possible transfer of energy?
You twirl a over your head at a tangential speed of 3.80 per secondWhat is the contripetal acceleration of the lasso's from your hand m / (s ^ 2)
The centripetal acceleration of the lasso's from your hand is determined as 5.78 m/s².
What is the centripetal acceleration?The centripetal acceleration of the lasso's from your hand is calculated by applying the following formula as shown below.
a = ( v² ) / ( r )
where;
v is the tangential speed r is the radius of the circular path.a = ( 3.8 m/s )² / ( 2.5 m )
a = 5.78 m/s²
Thus, the centripetal acceleration of the lasso's from your hand is a function of the tangential speed and the radius of the circular path.
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The complete question is below:
You twirl a over your head at a tangential speed of 3.80 per secondWhat is the contripetal acceleration of the lasso's from your hand m / (s ^ 2), if the radius of the circular path is 2.5 m?
If the speed of the electron changes from 9 x 10^6 m/s to 2 x10^6 m/s, what is the change in its kinetic energy?
The definition of kinetic energy for a mass m object moving at a velocity v is... One can demonstrate this by showing that if an object's height has increased by an amount y, then.
What do you mean by kinetic energy?A thing or particle's ability to move gives it kinetic energy, a form of power. An object source of globally through work, advancing and collecting kinetic energy as a result of being exposed to a net force.
The kinetic energy equation: what is it?The equation for kinetic energy is K E = 1 2 m v 2. KE stands as kinetic energy, where m stands for the total body weight and v for its speed.
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Give the SI base unit of each of these quantities. Enter the abbreviation rather than the name of the unit. a. Massb. lengthc. timed. temperature a. kgb. mc. sd. K
Measurements in seconds, kilograms, meters, and kelvins are all SI units.
The fundamental unit of time has an acronym, what is it?SI time is represented by the sign for a second, or s. The unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, which has a fixed numerical value of 9 192 631 770 when stated in the unit Hz, or s-1, is known as the caesium frequency, or vCs.The kilogram is the SI unit for mass (kg). A body's weight in a given reference frame is described in science and technology as the force that causes it to accelerate at a rate equal to the local acceleration of free fall in that frame.Measurements in seconds, kilograms, meters, and kelvins are all SI units.To learn more about fundamental unit refer to:
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Plot the volume of a spherical tank as a function of its radius as a semi-log plot. Use a range of radius of (0, 10). Show proper labels on the axes. Give the plot a suitable title.
Hint: Volume of a spherical tank= 4/3πr^3
.
The volume of a spherical tank with a radius of (0, 10) is calculated as 4/3πr3, or 4/3π × 153 = 14,137 m3.
The volume of a sphere is calculated using the formula V = 4/3πr³, where r is the radius. The volume of a cylindrical tank with a radius of 15 m and a height of 20 m is calculated as πr2h, or π × 152 × 20 = 11,309 m3.
Therefore, the ratio of the volume of the spherical tank to the volume of the cylindrical tank is 14,137/11,309 = 1.24.
This means that the spherical tank has 24% more volume than the cylindrical tank.
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On the Earth, you can see the ground in someone’s shadow; on the moon, you can’t—the shadow is deep black. Explain the difference.
Therefore, the moon itself casts shadows on the moon when sunlight hits its surface and is reflected, appearing as moonlight from Earth.
Why is the moon's surface in shadow? The so-called Rayleigh dispersion effect is one of the scientific features that can distinguish between the Earth and the moon.This idea is known as the dispersion of electromagnetic radiation, including visible light, by particles whose size is significantly smaller than the wavelength of the photons being scattered.Even our "shadows" can be seen clearly because to our atmosphere.The shadows on the moon appear darker when there is no atmosphere present or any other mechanism that allows sunlight to be absorbed or refracted away from the area in its shadows. Therefore, the moon itself casts shadows on the moon when sunlight hits its surface and is reflected, appearing as moonlight from Earth.To learn more about moon's surface refer
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A rock is tossed straight up from ground level with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. a. What is the rock’s velocity as it hits the bottom of the hole? b. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
a. The velocity of the rock as it hits the bottom of the hole is given by the equation of motion:
v = v₀ + a * t, where v₀ is the initial velocity (20 m/s), a is the acceleration due to gravity (-9.8 m/s²), and t is the time it takes to fall.
We can use the equation h = v₀ * t + 0.5 * a * t^2 to find t. Plugging in the initial velocity and the height of the hole, we have:
10 = 20 * t - 0.5 * 9.8 * t^2
Solving for t, we find that t = 1.5 s.
Finally, we plug t back into the first equation to find v:
v = 20 + (-9.8) * 1.5 = 20 - 14.7 = 5.3 m/s
So the rock has a velocity of 5.3 m/s as it hits the bottom of the hole.
b. The total time the rock is in the air can be found by adding the time it takes to reach its maximum height (t = v₀ / a) to the time it takes to fall back down to the bottom of the hole (t = √(2 * h / a)).
t = v₀ / a + √(2 * h / a)
Plugging in the initial velocity, the height of the hole, and the acceleration due to gravity, we have:
t = 20 / -9.8 + √(2 * 10 / -9.8)
t = 2.04 s
So the rock is in the air for a total of 2.04 s, from the instant it is released until it hits the bottom of the hole.
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A rollerskating mom has 10,000 kgm/s of momentum. As she's skating, she picks up her 20kg son, who is at rest. What is the momentum of the mom and son together?
Must post first.
After reading Chapter 7. describe how genetics and environment affect intelligence.
Do you believe your level of intelligence was improved because of the stimuli in your childhood environment? Why or why not?
Even if a kid has high IQ genes, if he or she grows up in a depressed setting with poor nutrition or little access to cerebral stimulation, the child may not perform well on IQ tests. The features and architecture of the brain define the intellect of everyone, including you and me. These are the outcomes of our inherited genes. Environment encounters can lower intellect (disease, toxins, and head trauma). In early children, there is a common environmental variance, but it disappears about age 12. The remaining trends include a growing IQ heredity and a decreasing variance related to the nonshared environment.
Thanks.
Specify all quantum numbers for the electrons in the 3p state in Zr. Do the same for the 4p state in Ba.
The 3p subshell is filled for titanium atoms and Each electron has n = 3 and l = 1. The [tex]m{eq}_l {/eq}[/tex] values range from -1 to +1. The [tex]m{eq}_s {/eq}[/tex] values are either +1/2 or -1/2.
What is quantum numbers?The path and motion of an electron in an atom can be described using quantum numbers. The Schrodinger equation must hold true for the total quantum numbers of all the electrons in a particular atom.
Quantum numbers are the set of digits used to express the location and energy of an electron in an atom. There are four quantum numbers: the principal, azimuthal, magnetic, and spin quantum numbers.
Quantum numbers specify the values of a quantum system's conserved quantities. A group of numerical values that offer solutions to the Schrodinger wave equation for hydrogen atoms are known as electronic quantum numbers (the quantum numbers describing electrons).
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Water diversion projects may involve the movement of water to dry regions using? A.canals
B.dams
C.reservoirs
D.sprinklers
Water diversion projects may involve the movement of water to dry regions using canals
Hence, option (a) is the correct choice.
Water diversions are made up of a system of structures and measures that intercept clear surface water runoff upstream of a project site, transport it around the work area, and discharge it downstream with minimal water quality degradation for either project construction operations or diversion construction.
Water diversion projects may involve the movement of water to dry regions using canals, reservoirs, and/or pipelines.
Dams can be used to store water for later use in these projects, but sprinklers are typically not involved in water diversion projects.
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Near the surface of the moon, the distance that an object falls is a function of time. It is given by d(t) = 2.6667t^2, where t is in seconds and d(t) is in feet If an object is dropped from a certain height, find the average velocity of the object from t = 1 sec. to t = 2
The average velocity of the object from t = 1 sec. to t = 2 is 8 feet / sec.
calculate the average velocity of the object from t = 1 sec. to t = 2?
Average velocity is change in position over change in time.
To calculate this, we can see where the object is at t = 1 and where the object is at t = 2.
At t = 1:
d(t = 1) = 2.667 * (1)2 = 2.667 ft
At t = 2:
d(t = 2) = 2.667 * (2)2 = 10.667 ft
Our change in position is 10.667 - 2.667 = 8 feet
Our change in time is 2 sec - 1 sec = 1 second
Our average velocity between t = 1 and t = 2 is then 8 feet / sec.
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