Question

Initially, a balloon has $2g$ of air inside it. A small hole is pierced into it. The air comes out with a velocity of $4m/s$. If the balloon shrinks completely in $2.5s$, the average pressure acting on the balloon is:

• A. $0.008N$
• B. $0.0032N$
• C. $8N$
• D. $3.2N$

Answer 1

The correct option is B $0.0032N$

As in physics the force is rate of change of momentum

$F=\frac{(0.002\times 4)}{0.25}=0.0032N$