posted by Tiffany on .
During a circus performance, a 73.1-kg human cannonball is shot out of a 19.5-m-long cannon. If the human cannonball spends 0.921 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
His average speedm in the cannon is
Vav = 19.5/0.921 = 21.17 m/s
The exit velocity is twice that, or
Vfinal = 42.35 m/s
For the accleration,
a = Vfinal/0.921s = 46.0 m/s^2
The average force (in newtons) is the mass (in kg) times the acceleration.