A ball rolls from rest down a roof without slipping. the roof has pitch of 30 degree until there is a flat, horizontal section near the edge of the roof. the ball lands 2 meters away from the horizontal position of the edge of the roof. The edge of the roof is located 5m above the ground.
a. how far did the ball roll down the sloped portion of the roof?
b. what was its angular momentum when it left the roof?
c. what was its total kinetic energy just before it hit the ground?