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Motion in Straight Line
Question
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Mass of a body is 10 kg at the surface of the earth. At what depth does its mass reduce to 5 kg?

Answer

Mass of the body is proportional to the quantity of matter contained in the body and independent of the acceleration due to gravity.
Therefore, the mass of the  body does not change with depth and hence it will not be 5 kg anywhere.  

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Some More Questions From Motion in Straight Line Chapter

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?