Question

A machine gun of mass $10\, kg$ fires $20 \,g$ bullets at the rate of $180$ bullets per minute with a speed of $100 \,m s ^{-1}$ each The recoil velocity of the gun is

• A. $0.6\, m / s$
• B. $2.5\, m / s$
• C. $1.5 \,m / s$
• D. $0.02\, m / s$

Answer 1

Answer: (A)

$0.6\, m / s$

Answer 2

The correct option is(A): 0.6m/s.
$20×10^{−3}×\frac{180}{60}​×100=10V$
⇒v=0.6m/s