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Question

A balloon has a mass of 10g in air. The air escapes from the balloon at a uniform rate with a velocity of 5cm/s and the balloon shrinks completely in 2.5 sec, calculate the average force acting on the balloon.

A
20 dyne
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B
5 dyne
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C
0 dyne
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D
10 dyne
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Solution

The correct option is A 20 dyne
As per the given question, mass = m = 10 g,
Velocity = v = 5 cm/s
Time taken = t = 2.5 s
We know,
force =vmt=5×102.5=20gcm/sec2
Therefore, the average force acting on the balloon is equal to 20gcm/sec2

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