Question

A machine gun fires 50gm bullets at a speed of 1000m/s. the gunner holding the gun in his hands can exert an average force of 180 N against the gun . Determine the maximum number of bullets that can be fired per minute .

• A. 60
• B. 120
• C. 216
• D. 300

Answer 1

The correct option is C 216

It is the impulsive force so...

$I=mv$

$=50\times {10}^{-3}kg\times 1000=50$

If man can hold the gun at a recoiling force of 180N so in 1 min

$180\ast 60=10800$

No. Of bullets per min = force * time /impulse

So $=\frac{10800}{50}=216$