Q. A gun fires $N$ bullets per second, each of mass $m$ with velocity$\ v$. The force exerted by the bullets on the gun is
A) $vNm$
B) $\frac{mv}{N}$
C) $mvN^{2}$
D) $\frac{mv^{2}}{N}$
Explanation
(a) $Force = \frac{p}{t} = \frac{N\ m(v - u)}{t}$
$= m\ N\ v\ \ \ \ (as\ u = 0,\ t = 1\ s)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.