A machine gun fires a bullet of mass 40 g 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 be fire per second at the most?

Options

A. One
B. four
C. two
D. three

Answer

4

Explanation

The force exerted by machine gun on man's hand firing a bullet
=change in momentum per second on a bullet or rate of change of momentum
`=(40/1000)xx1200=48 N`
The force exerted by man on machine gun
=144 N
Hence, number of bullets fired =`144/48 =3`