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Question

A balloon has 5g of air. A small hole is pierced into it. The air escapes at a uniform rate with a velocity of 4cm/s. If the balloon shrinks completely in 2.5 seconds, then the mean force acting on the balloon is:

A
2dyne
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B
50dyne
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C
8dyne
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D
8N
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Solution

The correct option is C 8dyne
Meanforce=change in momentumtime
Units are given in CGS unit, Hence force will be in dyne
hence Mean force=5×42.5=8 dyne

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