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  4. A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm / s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).

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Q. A balloon has mass of $10\, g$ in air. The air escapes from the balloon at a uniform rate with velocity $4.5 \,cm / s$. If the balloon shrinks in $5\, s$ completely. Then, the average force acting on that balloon will be (in dyne).

JEE MainJEE Main 2022Laws of Motion

Solution:

$ F =\frac{ dm }{ dt } v $
$ =\frac{10 g }{5 s }\left(4.5 \frac{ cm }{ s }\right)=9 \frac{ gcm }{ s ^2}=9 $ dyne