Answer to Question #337660 in Mechanics | Relativity for Kelly

Question

Find the velocity of a recoil of a gun of mass 5 kg from which a bullet of mass 10 g is fired at a velocity of 250m/sec-1

Answer 1

The conservation of momentum gives

$$v=\frac{m}{M}u=\frac{0.01}{5}*250=0.5\:\rm m/s$$