i need help asappp

Lots of scientists had worked on the periodic table other than Mendeleev. What did Dmitri Mendeleev do that set him apart from all of the other scientist?
How do you think Mendeleev was able to so accurately estimate the properties of undiscovered elements?
What do you think would have changed if all of the scientist had worked closely together to figure out the best way to arrange the periodic table? Do you think collaboration is always the best answer

The equivalent impulse value imparted on the arrow is 2.37 Ns,

option A

The equivalent impulse value imparted on the arrow can be determined using the equation for impulse, which is given by;

Impulse = force x time.

Since the arrow is moving with a constant velocity, the time during which the force is applied can be determined using the principle of conservation of momentum. The change in momentum of the arrow-bow system is equal to the impulse applied to the arrow, and the force applied to the arrow is equal to the recoil force experienced by the bow.

The initial momentum of the arrow-bow system is equal to the mass of the arrow times its velocity. The final momentum of the arrow-bow system is equal to the mass of the bow times its recoil velocity.

The change in momentum of the arrow-bow system is given by:

Δp = pf - pi = (m_bow * v_recoil) - (m_arrow * v_arrow)

The impulse applied to the arrow is equal to the change in momentum of the arrow-bow system:

impulse = Δp = (m_bow * v_recoil) - (m_arrow * v_arrow)

Using the given masses and velocities, we can calculate the impulse:

impulse = (0.0245 kg) * (87.3 m/s) - (0.0272 kg) * (87.3 m/s) = 2.37 Ns

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The Compton effect can be explained on the basis of the quantum theory of light and the wave theory of scattered radiation, hence option B is correct.

The compton effect, photoelectric effect, and blackbody radiation are described by the quantum theory of light, while interference and diffraction are explained by the wave nature of light.

It causes X-rays and other powerful electromagnetic radiations to have longer wavelengths after being elastically dispersed by electrons.

Therefore, the compton effect, also known as Compton scattering, is the primary mechanism by which radiant energy is absorbed in the matter.

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The given question is incomplete, so the most probable complete question is,

Can someone answer this question about the Compton effect?

The Compton effect can be explained on the basis of __________

a) Wave nature of light

b) Quantum theory of light

c) Ray optics

d) Wave optics

Answer:

10 g at 10°C

Explanation:

Answer:

10 g at 10°C

Explanation:

Heat energy is directly proportional to the mass and the temperature of a substance. When comparing two samples of the same substance, the one with higher mass contains more heat energy. Similarly, a substance with higher temperature contains more heat energy compared to the same substance with a lower temperature.

In this case, the smallest amount of heat energy would be in the sample of 10g at 10°C. This is because it has the lowest mass and temperature compared to the other three options.



ALLEN

Newton's third law of motion states that "for every action, there is an equal and opposite reaction." In the case of a hose pipe, this law applies to the forces involved in the flow of water through the hose.

When water is flowing through the hose, it is being accelerated by the pressure difference between the inlet and outlet of the hose. As the water moves through the hose, it exerts a force on the walls of the hose, pushing them outwards. This is the "action" described in Newton's third law.

According to the law, there must be an equal and opposite "reaction" force. In this case, the reaction force is the force that the hose exerts on the water. The force of the hose pushing outwards is equal and opposite to the force of the water pushing inwards.

This reaction force is what allows the water to flow through the hose. Without it, the water would not be able to move through the hose and would instead remain stationary.

So, in summary, in the case of a hose pipe, Newton's third law of motion applies to the forces involved in the flow of water through the hose. The force that the water exerts on the hose is equal and opposite to the force that the hose exerts on the water, and this allows the water to flow through the hose.

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The amount of power it takes to lift 55N 3 m high in 12.00s is 13.75 Watts.

The power needed to lift an object can be calculated by dividing the work done on the object by the time taken as follows:

Power = work done ÷ time

However, the work done on an object can be calculated by multiplying the force on the object by the distance moved.

Work done = force × distance

Work done = 55N × 3m = 165J

Power = 165J ÷ 12s = 13.75Watts

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The magnitude of the parallel component of the velocity is 1.4 m/s

The direction is in the direction of rotation of the carousel.

The velocity of the child can be calculated using the equation for centripetal acceleration:

a = v^2 / r

where

Rearranging the equation to solve for velocity:

v = √(ar)

The centripetal acceleration is equal to the square of the angular velocity, w, multiplied by the radius:

a = w^2 x r

where

Since the carousel completes one revolution every 14.1 seconds, the angular velocity can be calculated as:

w = 2π / T

w = 2π / 14.1

Now we can calculate the centripetal acceleration:

a = w^2 x r

a = (2π / 14.1)^2 x 7.0

a = 1.41 m/s²

Finally, we can use this value to calculate the velocity of the child:

v = √(ar)

v = √(1.41 x 7.0)

v = 3.14 m/s

The magnitude of the velocity is the scalar value, or the size of the velocity vector without direction.

The direction of the velocity is perpendicular to the radial line connecting the child to the center of the carousel. It is in the direction that the child is moving.

The parallel component of the velocity is in the direction of the rotation of the carousel and can be calculated using the projection of the velocity onto a line tangent to the circle.

dp/dt = v dθ/dt

where

Substituting the values for velocity and angular velocity:

dp/dt = vw

= 3.14 x (2π / 14.1)

v = 1.4 m/s

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During the Vietnam War, journalists often referred to the military's press briefings as "five o'clock follies" because they felt that the information provided was often incomplete or misleading.

The two choices that are correct are:

•Called the military's press briefings "five o'clock follies"

•Did not witness any combat on a firsthand basis.

. Additionally, due to the dangers of the conflict, many journalists did not have the opportunity to witness combat on a firsthand basis.

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Your weight at the top of the ladder would be one-quarter of its normal value. The correct option is C.

The gravitational pull of the Earth, denoted by g, is the net acceleration imparted to objects by the combined effect of gravitation and centrifugal force. It is a vector quantity whose direction corresponds to a plumb bob and whose strength or magnitude is determined by the norm.

The formula for gravity is,

g = GM / R²

g = 1 / R²

gt = 1 / (2R)²

gt / g = R² / 4R²

gt = 1 / 4g

Therefore, at the top of the ladder, your weight would be one-quarter of its normal value.

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A resistor is connected to a 9.0V battery with a 0.50A current flowing through it. Then the resistance is 18 Ω.

When a 9.0-volt battery is connected to a resistor, an electric field is created that pushes electrons through the resistor. The voltage of the battery represents the potential energy that each electron has when it enters the circuit, while the resistor creates a resistance that slows down the flow of electrons. According to Ohm's law, the current (I) through a resistor is directly proportional to the voltage (V) applied across it and inversely proportional to the resistance (R) of the resistor. The relationship can be expressed as:

I = V / R

In this case, the current is given as 0.50 A, and the voltage of the battery is 9.0 V.

= R

= V / I

= 9.0 V / 0.50 A

= 18 Ω

So the resistor in the circuit has a resistance of 18 ohms, and it is causing a current of 0.50 A to flow through it when the 9.0-volt battery is connected.

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Question - A 9. 0-v battery is connected to a resistor so that there is a 0. 50-a current through the resistor. Then the resistance is?

The frequency of the wave, given that 120 waves were produced per minutes is 2 Hertz

Frequency is defined as the number of complete oscillations made in 1 second.

From the question given above, the following were obtained:

Thus, to obtain the frequency (in per second), we shall convert 120 waves per minute to per second. Details below:

1 wave per minute = 1/60 wave per second

Therefore,

120 wave per minute = 120 × 1/60

120 wave per minute = 2 waves per second

120 wave per minute = 2 Hertz

Thus, we can conclude from the above calculation that the frequency is 2 Hertz

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Answer:

net force

Explanation:

a) the magnitude of the force parallel to surface 1 is 6.13 N

b) the magnitude of the force parallel to surface 2 is 4.02 N.

The gravitational force acting on each object is given by F = m * g

where m is the mass of the object

and g is the acceleration due to gravity (g = 9.8 m/s^2 on the surface of the earth).

Let's call the force parallel to surface 1 F1, and the force parallel to surface 2 F2.

a) To calculate the magnitude of F1:

F1 = m1 * g * cos(angle of elevation of surface 1)

m1 = .800 kg (mass of object on surface 1)

angle of elevation of surface 1 = 40 degrees

F1 = .800 kg * 9.8 m/s^2 * cos(40) = 6.13 N (approx.)

b) To calculate the magnitude of F2:

F2 = m2 * g * cos(angle of elevation of surface 2)

m2 = .500 kg (mass of object on surface 2)

angle of elevation of surface 2 = 55 degrees

F2 = .500 kg * 9.8 m/s^2 * cos(55) = 4.02 N (approx.)

So, the magnitude of the force parallel to surface 1 is 6.13 N and the magnitude of the force parallel to surface 2 is 4.02 N.

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Answer:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Explanation:

Answer:

[tex]\huge\boxed{\sf R = 360\ ohms}[/tex]

Explanation:

Potential Difference = V = 9 V

Current = I = 0.025 A

Resistance = R = ?

V = IR (Ohm's Law)

V = IR

Divide I to both sides

[tex]\displaystyle \frac{V}{I} = R[/tex]

Put the given data

9/0.025 = R

360 ohms = R

OR

[tex]\rule[225]{225}{2}[/tex]

This is because RNA uses uracil instead of thymine, so the complementary base pair for adenine in RNA is uracil, not thymine. Therefore, the RNA strand transcribed from the given gene sequence would contain 49 uracil base pairs, not thymine.

In DNA, adenine always pairs with thymine and cytosine always pairs with guanine. However, in RNA, the base uracil replaces thymine, and adenine always pairs with uracil instead.

Therefore, when a gene sequence containing 49 adenine base pairs is transcribed into an RNA strand, the RNA strand will contain 49 uracil base pairs. This is because each adenine in the DNA strand will pair with a uracil during transcription.

It's important to note that transcription is the process by which DNA is used as a template to create RNA. During transcription, the DNA sequence is "read" by an enzyme called RNA polymerase, which creates an RNA strand by adding nucleotides one at a time in a complementary manner. In this case, the RNA polymerase would add uracil nucleotides to the growing RNA strand to match the adenine nucleotides in the DNA strand.

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Answer:

Explanation:

Because the scientists still had seeds from the pre-drought mustard plants collected in 1997, they were in a perfect position to find out whether the change in flowering time was really due to evolution. They grew pre-drought seeds alongside seeds collected from the exact same sites in 2004, after the drought.

There are many ways that scientists could have discovered that the flowering time of the field mustard had changed. One possible way is through direct observation and monitoring of the plant's growth and development over time. Another possible way is through the analysis of historical records or herbarium specimens.

Mustard is a plant species that belongs to the Brassicaceae family, which also includes other common plants such as broccoli, cabbage, and cauliflower. The mustard plant is characterized by its small yellow flowers, which grow on a tall stem with leaves that are either lobed or unlobed.

Mustard has been cultivated for centuries for its seeds, which are used to produce mustard condiments, as well as for its leaves, which are used in salads and as a cooked vegetable. There are several different varieties of mustard, including white mustard (Sinapis alba), brown mustard (Brassica juncea), and black mustard (Brassica nigra).

Flowering timing refers to the time when a plant produces flowers, which is an important aspect of its life cycle. The timing of flowering can be influenced by several factors, including environmental conditions such as temperature, light, and water availability, as well as genetic factors.

Flowering timing is important for plant reproduction, as it determines when the plant will produce seeds. In many plant species, the timing of flowering is also influenced by environmental cues such as day length, which can trigger the plant to flower at specific times of the year.

Understanding flowering timing in plants is important for agriculture, as it can help farmers optimize crop yields by selecting the right varieties of plants for specific growing conditions and by manipulating environmental factors to promote optimal flowering. It is also an important area of research in plant biology, as scientists seek to understand the genetic and molecular mechanisms that control flowering timing in different plant species.

Here in the question,

There are several ways that scientists could have discovered that the flowering time of the field mustard had changed. One possible way is through direct observation and monitoring of the plant's growth and development over time.

For example, scientists may have regularly visited a field of mustard plants and recorded the timing of flowering for several years. By comparing the data from different years, they could have detected changes in the flowering time of the plants.

Another possible way is through the analysis of historical records or herbarium specimens. Herbarium specimens are dried and pressed plants that are stored in a collection for scientific study. By examining herbarium specimens collected from the same location over time, scientists could determine whether there had been any changes in the timing of flowering.

Additionally, researchers may have used satellite imagery to track changes in vegetation over time. By analyzing changes in the color and density of vegetation in a particular area, they could detect changes in the timing of flowering for different plant species, including field mustard.

Therefore, there are many different methods that scientists could have used to discover changes in the flowering time of field mustard, and it is likely that a combination of these methods was used to confirm the change.

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Statement b and d are inconsistent with Dalton's atomic theory.

Dalton's atomic theory, as originally stated, includes the following postulates:

All matter is made up of tiny, indivisible particles called atoms.

All atoms of a given element are identical in mass and properties.

Compounds are formed when atoms of different elements combine in fixed ratios.

Chemical reactions involve the rearrangement of atoms; no atoms are created, destroyed or changed into atoms of another element.

Statement b contradicts postulate 3 by suggesting that a water molecule is formed from 1.5 hydrogen atoms and 1 oxygen atom. However, in Dalton's theory, atoms combine in whole-number ratios to form compounds.

Statement d contradicts postulate 4 by suggesting that the formation of a compound involves the destruction of one or more atoms. However, in Dalton's theory, atoms are neither created nor destroyed in chemical reactions. Instead, they are rearranged to form new compounds.

Statement a and c are consistent with Dalton's atomic theory as all atoms of a given element are identical in mass and properties and compounds are formed when atoms of different elements combine in fixed ratios.

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Answer:

find the average speed in km/h, we need to convert the time from minutes to hours, then divide the total distance by the total time.

First, let's convert the time from minutes to hours:

30 minutes ÷ 60 minutes/hour = 0.5 hours

Next, we can calculate the average speed:

2.4 km ÷ 0.5 hours = 4.8 km/h

So the average speed of the walker for this distance is 4.8 km/h.

(a) Equilibrium is a state in which sum of all the forces acting on an object in a particular direction is zero.

(b) The triangle vector is in the image uploaded.

(c) The value of tension 1 and tension 2 are 191.4 N and 160.58 N.

Equilibrium is the condition of a system when neither its state of motion nor its internal energy state tends to change with time.

The value of the tensions, T1 and T2 is calculated as follows;

The sum of the vertical forces is calculated as follows;

T1 sin(50) + T2 sin(40) - 250 sin(90) = 0

0.766T1 + 0.643T2 - 250 = 0

0.643T2 = 250 - 0.766T1

The sum of the horizontal forces is calculated as follows;

-T1 cos(50) + T2 cos(40) + 250 cos(90) = 0

-0.643T1 + 0.766T2 + 0 = 0

0.766T2 = 0.643T1

T2 = (0.643T1) / (0.766)

T2 = 0.839T1

0.643 (0.839T1) = 250 - 0.766T1

0.54T1 + 0.766T1 = 250

1.306T1 = 250

T1 = 250 / 1.306

T1 = 191.4 N

T2 = 0.839T1

T2 = 0.839 x (191.4 N)

T2 = 160.58 N

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The charge on each plate is 2.608×10⁻⁸ C. Charge is a fundamental physical property of matter that describes the degree to which it interacts with electromagnetic fields.

Describe Charge?

It is an intrinsic property of subatomic particles, such as protons and electrons, that gives rise to electric and magnetic forces.

The basic unit of charge is the Coulomb (C), named after the French physicist Charles-Augustin de Coulomb, who first quantified the electric force between charged objects. A single proton or electron has a charge of approximately 1.6 x 10⁻¹⁹ Coulombs.

Electric charge is conserved, which means that the total amount of charge in a closed system remains constant over time. Charges can be positive, negative, or neutral, and like charges repel each other, while opposite charges attract each other.

The electric field between two parallel plates is given by:

E = V/d

where E is the electric field, V is the potential difference between the plates, and d is the distance between the plates.

In this case, the desired electric field is E = 6.50×10⁵ V/m, and the distance between the plates is d = 2.45 mm = 0.00245 m. So, we can solve for the potential difference between the plates as:

V = Ed = (6.50×10⁵ V/m)(0.00245 m) = 1592.5 V

Since the potential difference between the plates is the same as the potential difference across the capacitor, we can use the formula for the capacitance of a parallel plate capacitor to find the charge on each plate:

C = ε0A/d

where C is the capacitance, ε0 is the permittivity of free space, A is the area of each plate, and d is the distance between the plates.

Plugging in the given values, we get:

C = (8.85×10⁻¹² F/m)(0.00045 m²)/(0.00245 m) = 1.635×10⁻¹¹ F

Finally, we can find the charge on each plate using the formula:

Q = CV

where Q is the charge on each plate, C is the capacitance, and V is the potential difference between the plates. Plugging in the values we found, we get:

Q = (1.635×10⁻¹¹ F)(1592.5 V) = 2.608×10⁻⁸ C

Therefore, the charge on each plate is 2.608 ×10⁻⁸ C.

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The gravitational potential energies are 300 kJ and 400 kJ respectively

Gravitational potential energy is a form of potential energy that an object possesses due to its position relative to a reference point in a gravitational field. It is defined as the amount of work that must be done to move an object from its current position to a reference point, without changing its speed or direction.

The gravitational potential energy of an object can be calculated using the formula:

For the first case;

Note that the mass of  2500 L is 2500 Kg

With respect to the floor;

2500 Kg * 10 * 12 = 300 kJ

With respect to the basement;

2500 * 10 * 16 = 400 kJ

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The rotational acceleration and speed are shared by all of the points of a rigid body. As a result, the angular acceleration is positive and the rotation is anticlockwise.

A- 2*[(m1 - m2)/(m1 + m2)] *g/L The angular acceleration is positive and the rotation is anticlockwise. (m1 - m2)/(m1+ m2 + mbar/3) B- 2* *g/L The angular acceleration is positive and the rotation is anticlockwise.

(A) The magnitude of angular acceleration of the seesaw in this case is .

2(m₁-m₂)g÷(m₁+m₂)L

(B) The magnitude of angular acceleration of the seesaw in this case is

(m₁ g-m₂ g)÷(m₁+m₂)L

For a massless sea saw bar, with attached masses at each end, the torque produced due to the masses is,

ω=(m₁+m₂)+1/2

And, moment of inertia of the system of two masses is,

I=(m₁+m₂)L/4

The using the expression of torque as,

Angular acceleration is the term used to describe the temporal pace at which angular velocity varies. Radians per second is the accepted unit of measurement. Therefore, = d d t. Angular acceleration is also known as rotational acceleration.

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Por lo tanto, la pelota fue lanzada con una velocidad inicial de 14.7 m/s y alcanzó una altura máxima de 11.3 m.

Generally, Para resolver este problema, necesitamos conocer la relación entre la velocidad inicial con la que se lanza la pelota y la altura máxima que alcanza. Podemos usar las ecuaciones de movimiento para un objeto que se mueve verticalmente con aceleración constante.

Primero, consideremos el momento en que la pelota es lanzada. En ese momento, la velocidad inicial de la pelota es v0, que es lo que estamos buscando. Usando la ecuación de posición vertical:

y = v0t - 1/2gt^2

donde y es la altura alcanzada, t es el tiempo transcurrido, y g es la aceleración debido a la gravedad (-9.8 m/s^2), podemos despejar v0 en términos de y y t:

v0 = (y + 1/2gt^2) / t

Ahora, consideremos el momento en que la pelota es atrapada, 3.0 s después de ser lanzada. Sabemos que en ese momento, la velocidad vertical de la pelota es cero, ya que está en su punto más alto. Usando la misma ecuación de posición vertical, pero estableciendo y = 0 y v = 0, podemos encontrar el tiempo que tarda la pelota en llegar a su altura máxima:

0 = v0t - 1/2gt^2

t = 2v0/g

Sustituyendo este valor de t en la ecuación anterior, podemos encontrar la altura máxima que alcanza la pelota:

y = v0(2v0/g) - 1/2g(2v0/g)^2

y = v0^2/2g

Ahora podemos calcular los valores numéricos. Si asumimos que la altura a la que el jugador atrapa la pelota es la misma que la altura máxima alcanzada por la pelota, y tomamos g = -9.8 m/s^2, entonces:

v0 = (y + 1/2gt^2) / t = (0 + 1/2(-9.8 m/s^2)(3.0 s)^2) / 3.0 s = 14.7 m/s

y = v0^2/2g = (14.7 m/s)^2 / (2(-9.8 m/s^2)) = 11.3 m

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The momentum of the driver is  1,750 kgm/s.

Momentum refers to an object's tendency to maintain its velocity (or speed) in a straight line unless acted upon by an external force.

The magnitude of momentum is determined from the product of mass and velocity of the object.

The momentum of the driver is calculated as follows;

P = mv

where;

P = 70 kg x 25 m/s

P = 1,750 kgm/s

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The total displacement of the diagram in the velocity-time graph is 55 m.

To find total displacement from a velocity-time graph, the area under the curve of the graph is calculated.

Considering the given figure:

The area under the velocity-time graph is composed of two triangles ABF & DCE having area A₁ & A₂ respectively, and a rectangle BEIF having area A3.

The area of A₁ = (2- 0) × (5 - 0)/2 = 5 m

The area of A₂ = (10 - 5) × (10 - 6)/2 = 10 m

The area of A₃ = (5 - 0) * (10 - 2) = 40 m

The total area under the curve = A₁ + A₂ + A₃

The total area under the curve = 5 + 10 + 40 =

The total area under the curve = 55 m

Therefore, the total displacement is 55 m.

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Answer:

Explanation:

Displacement, velocity, and acceleration are fundamental concepts in physics that describe the motion of objects.

Velocity is a vector quantity that describes the rate of change of an object's position in a particular direction. It is defined as the displacement (the change in position) divided by the time it took to cover that displacement.

Acceleration is the rate of change of velocity, or the rate at which an object changes its speed or direction of motion. It is a vector quantity that is defined as the change in velocity divided by the time it took to achieve that change.

The change in velocity, also known as the delta velocity, is the difference between the initial velocity (v₁) and the final velocity (v₂). In this case, the change in velocity can be calculated as follows:

Δv = v₂ - v₁ = 1.2 mm/s - 1.0 mm/s = 0.2 mm/s

So, the turtle's velocity changes by 0.2 mm/s from 1.0 mm/s to 1.2 mm/s at 0=20°.

In summary, velocity describes the rate of change of an object's position, acceleration describes the rate of change of velocity, and the change in velocity is the difference between the final and initial velocities.

The average speed for rest of the journey = (632.1 - 281.55) / 5.8  km/hr = 88.4 km/hr.

Average speed is a measure of the rate of change of a certain distance traveled over a period of time. It is usually calculated by dividing the total distance traveled over time, usually in hours, minutes, or seconds. Average speed is a measure of the average rate of motion, not necessarily the actual speed at any given moment.

Let the total distance covered be D. Time taken for first third of the journey = 8.7/3 hrs = 2.9 hrs
Distance covered in first third of the journey = 2.9 * 96.5 km/hr = 281.55 km
Therefore, distance covered in rest of the journey = D - 281.55 km
Time taken for rest of the journey = 8.7 - 2.9 hrs = 5.8 hrs
Average speed for rest of the journey = (D - 281.55) / 5.8  km/hr
Substituting the value of D = 8.7 hrs * 73 km/hr = 632.1 km
Therefore, average speed for rest of the journey = (632.1 - 281.55) / 5.8  km/hr = 88.4 km/hr

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