Question

# A man of mass m is suspended in the air by holding the rope of a stationary balloon of mass M. As the man starts climbing up the rope, the balloon will

A
Move upward
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B
Move downward
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C
Remain stationary
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D
Cannot say
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Solution

## The correct option is B Move downwardInitially man and balloon are stationary. ∴ Net external force is zero and centre of mass of the system is initially at rest. Even when man starts moving up, the net external force will remain zero. ⇒ Position of centre of mass will not change. So to have Xcm = constant the balloon will move downwards.

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