Motion In Straight Line

Question

A car travels along a straight line with speed v₁ from A to B and returns back from B to A with speed v₂. What is the average speed of the car?

Solution

Here, the body covers equal distances with different speeds.

Avergae speed =

\frac{Total distance travelled}{total time taken}

Total distance = S₁ + S₂ = 2S ( because S₁ = S₂)

Total time =

\frac{S_{1}}{v_{1}} + \frac{S_{2}}{v_{2}} = S (\frac{1}{v_{1}} + \frac{1}{v_{2}})

Then,

Average speed, v_av =

\frac{2 S}{S (\frac{1}{v_{1}} + \frac{1}{v_{2}})}

That is, v_av

= \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}

Some More Questions From Motion in Straight Line Chapter

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion:

(a) A kite flying in the sky.

(b) The earth revolving around the sun.

(c) A train moving along the equator of the earth in clockwise direction.

(d) Accelerated motion of a particle in a straight line.

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Motion In Straight Line

A car travels along a straight line with speed v₁ from A to B and returns back from B to A with speed v₂. What is the average speed of the car?

Some More Questions From Motion in Straight Line Chapter

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion:

(a) A kite flying in the sky.

(b) The earth revolving around the sun.

(c) A train moving along the equator of the earth in clockwise direction.

(d) Accelerated motion of a particle in a straight line.

Define distance.

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For Daily Free Study Material Join wiredfaculty

Motion In Straight Line

A car travels along a straight line with speed v1 from A to B and returns back from B to A with speed v2. What is the average speed of the car?

Some More Questions From Motion in Straight Line Chapter

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: (a) A kite flying in the sky. (b) The earth revolving around the sun. (c) A train moving along the equator of the earth in clockwise direction. (d) Accelerated motion of a particle in a straight line.

Define distance.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A car travels along a straight line with speed v₁ from A to B and returns back from B to A with speed v₂. What is the average speed of the car?

State which of the following are examples of one, two or three dimensional motion:

(a) A kite flying in the sky.

(b) The earth revolving around the sun.

(c) A train moving along the equator of the earth in clockwise direction.

(d) Accelerated motion of a particle in a straight line.