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 $2.5sec$, calculate the average force acting on the balloon.

• A. $20$ dyne
• B. $5$ dyne
• C. $0$ dyne
• D. $10$ dyne

Answer 1

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 =$\frac{vm}{t}=\frac{5\times 10}{2.5}=20gcm/se{c}^2$

Therefore, the average force acting on the balloon is equal to $20gcm/se{c}^2$