From a rifle of mass 4kg, a bullet of mass 50g is fired with an initial velocity of 35m/s. calculate the initial recoil velocity of the rifle.

Since no external force acts on the rifle, the change in momentum is zero.

Mometum of rifle = Momentum of bullet.

4 x V = 0.050 x 35

V = 0.44 m/s.

This is the recoil velocity of rifle.