Question

A gun of mass $10kg$ fires four bullets per second. The mass of each bullet is $20g$ and the velocity of the bullet when it leaves the gun is $300m/s$. The force required to hold the gun while firing is

• A. $6N$
• B. $8N$
• C. $24N$
• D. $240N$

Answer 1

The correct option is C $24N$

Change in momentum per second due to bullets

$=4\times (20\times {10}^{-3})\times 300$

$=24N$ = Force required to hold the gun.