#### A machine gun fires a bullet of mass 40g with a velocity 1200 ms-1 The man holding it can exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most ? Option 1) one Option 2) four Option 3) two Option 4) three

As we learnt in

Newton's 2nd Law -

Therefore

- wherein

in C.G.S & S.I

Suppose he can fire $n$ bullets per second

Force = Change in momentum per second

$144= n\times \left ( \frac{40}{1000} \right )\times \left ( 1200 \right )$

$or\: \:\: \: n= \frac{144\times 1000}{40\times 1200}$

$or\: \:\: \: n= 3$

Correct option is 4.

Option 1)

one

This is an incorrect option.

Option 2)

four

This is an incorrect option.

Option 3)

two

This is an incorrect option.

Option 4)

three

This is the correct option.