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Q.

An escalator is moving down with constant speed A man is moving on it such that he remain at rest with respect to ground. Choose correct statement from reference frame fixed to an observer standing on the ground.

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a

work done by escalator on the man is negative.

b

work done by gravity (due to earth) on escalator is negative only

c

work done by the man on the escalator is zero.

d

work done by gravity (due to earth) on the man is zero.

answer is B.

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Detailed Solution

Work done by a force on the point of application in a frame =Fds in the reference frame 

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