A bullet of mass 0.01 kg is fired with a velocity of 100 m/s from a rifle of mass of 20 kg. The recoil of the rifle is

Mass of the bullet m = $0.01kg$

Velocity of the bullet = $100 m/s$

Mass of the gun = 20kg

According to law of conservation of linear momentum

MV = mv

$V=\frac{0.01\times 100}{20}=0.01\times 5$

$V=0.05m/s$