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JEE Main 2022 · 28 Jul · Shift 1, Physics question 34

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).

Choose one option
Answer and worked solution

Official answer: B

Thrust vdmdt=4.5×105=9v\frac{dm}{dt}=4.5\times\frac{10}5=9 dyne.

(B)

Topics:Variable mass systems
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