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Gravtiational PE

A ladder of l...

Question

A ladder of length l carrying a man of mass m at its end is attached to the basket of a balloon of mass M. The entire system is in equilibrium in the air. As the man climbs up the ladder into the balloon, the balloon descends by a height h.
The work done by the man is

A

mgl

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B

mgh

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C

mg

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D

mg(l-h)

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Solution

The correct option is D mgl
The work done by man $= m g l .$
Hence, the answer is $m g l .$

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