A shell of mass 8.2 kg is fired from a gun of mass 1270 kg, with a horizontal velocity of 427 m/s.

A shell of mass 8.2 kg is fired from a gun of mass 1270 kg, with a horizontal velocity of 427 m/s. Find the velocity of recoil of the gun and hence find the constant retarding force required to bring it to rest in a distance of 0.46 m