A ballon has 2 g of air . A small hole ...

A ballon has 2 g of air . A small hole is pierced into it . The air comes out with relative velocity 4 m/s . If the balloon shrinks completely in `2.5` s , the average force acting on the balloon is

`0.008 N `

`0.0032` N

8 N

3.2 N

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