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Motion in Straight Line
Question
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Particle P completes half revolution in circular orbit of radius 10m in 5s and another particle Q is moving along a straight line with constant speed 4 m/s. Which of the two particles has greater average speed?

Answer

Given, particle P completes half revolution in a circular orbit of radius 10m in 5s.
Therefore,
Particle P travels the distance πr =10π m in 5s.
Therefore,
Average speed of particle P = 2π m/s.
Particle Q is moving with constant speed 4m/s.
Therefore its average speed is also 4m/s. 

Hence, particle P has a greater average speed. 

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Some More Questions From Motion in Straight Line Chapter

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.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?