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प्रश्न
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).
विकल्प
3
9
12
18
MCQ
उत्तर
9
Explanation:
Force, F = `"dm"/"dt""v"`
= `10/5xx4.5`
= 9 dyne.
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