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Question

A man of mass m stands on a crate of mass M. He pulls on a light rope passing over a smooth light pulley. The other end of the rope is attached to the crate. For the system to be in equilibrium, the force exerted by the man on the rope will be

A
(M+m)g
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B
12(M+m)g
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C
Mg
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D
mg
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Solution

The correct option is B 12(M+m)g
From the free body diagram of man and crate system:
For vertical equilbrium
2T=(M+m)g
T=(M+m)g2

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