SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true?

a)

The truck moves opposite to direction of motion of the man even after the man ceases to walk

b)

The centre of mass of the man and the truck remains at the same point throughout the man’s walk

c)

The kinetic energy of the man and the truck are exactly equal throughout the man’s walk

d)

The truck does not move at all during the man’s walk


Question ID - 100231 :-

A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true?

a)

The truck moves opposite to direction of motion of the man even after the man ceases to walk

b)

The centre of mass of the man and the truck remains at the same point throughout the man’s walk

c)

The kinetic energy of the man and the truck are exactly equal throughout the man’s walk

d)

The truck does not move at all during the man’s walk

1 Answer
5876 Votes
3537

Answer Key : (b) -

(b)

In the absence of external force,  constant

Here initially  so  throughout, i.e., position of centre of mass, remains unshifted



Next Question :

 A solid sphere of mass and radius  is placed on a rough horizontal surface. It is struck by a horizontal cuestick at a height  above the surface. The value of  so that the sphere performs pure rolling motion immediately after it has been struck is

a)

b)

c)

d)


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