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Q.

A balloon has 5 gm of air. A small hole is pierced into it. The air escapes at a uniform rate with a velocity of4cms1 . If the balloon shrinks completely in 2.5 second, then the average force acting on the balloon is

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a

2 dyne

b

50 dyne

c

8 dyne

d

8 N

answer is C.

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Detailed Solution

F=mvt=5×42.5=8dyne

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A balloon has 5 gm of air. A small hole is pierced into it. The air escapes at a uniform rate with a velocity of4cms−1 . If the balloon shrinks completely in 2.5 second, then the average force acting on the balloon is