Question

A bullet of mass 60 g moving with a velocity of $500m{s}^{-1}$ is brought to rest in 0.01 s. Find the impulse and the average force of the blow.

Answer 1

Here, mass, $m=0.06kg$,

initial velocity,$u=500m/s$,

final velocity, $v=0m/s$,

time taken, $t=0.01s$

Impulse = mass x change in velocity

$=0.06kg\times (0-500)m/s$

$=30kgm/s$

Average Force, $F=\frac{m\times (v-u)}{t}=\frac{30}{0.01}=3000N$