calculate the recoil?

Question

A machine gun on the A-10 ground0 attack fighter aircraft fires 1300 rounds per minute, each of mass 1.4 kg, and attaining a speed of 800 m/s . Calculate the recoil experience by the aircraft.

Answer 1

The impulse needed to fire one round = ft = mv.
The A-10 experiences an average recoil force = mv/t = 1.4*800/(60/1300) N. The peak force can't be determined because we don't know either the acceleration or the duration of the acceleration of the round.