Question

A shell of mass 0.020 kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80ms^-1, what is the recoil speed of the gun?

Answer 1

m = 0.02kg, M = 100kg, v = 80ms^-1, V = ?

= -0.016ms^-1 = -1.6cm s^-1

Negative sign indicates that gun moves in a direction opposite to the direction of motion of the bullet.