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A man of mass m is standing on a station...

A man of mass m is standing on a stationary flat car of mass M. The car can move without friction along horizontal rails. The man starts walking with velocity v relative to the car. Work done by him

A

`Mu/(M+m)`

B

`Mv_0/(m+M)`

C

`u+v_0`

D

u

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The correct Answer is:
D
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