During a circus performance, a 67.2-kg human cannonball is shot out of a 17.1-m-long cannon. If the human cannonball spends 0.772 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

Answer 1

Assume a constant acceleration rate in the cannon. The average speed while going out is 17.1/0.772 = 22.15 m/s
The exit speed is twice that: 44.3 m/s

Impulse = Force*time = Momentum change
= (Mass)*(exit velocity)

Force = (Mass)(exit velocity)/time