Assignment:
A solid door of mass M = 20kg and width l= 1m is hit at a right angle by a mud ball of mass m = .5kg, which hits the door at the edge with speed v= 10m/s and sticks.
(a) What is the rotational inertia of the door about the hinges?
(b) What is the angular velocity of the door after having been struck?
(c) What fraction of the initial energy does the moving door-mud ball sytem retain?
