Aball whose mass is 0.2 kg hits the floor with a speed of 4 m/s and rebounds upward with a speed of 3 m/s. if the ball was in contact with the floor for 0.5 ms (0.5multiply10-3 s, what was the average magnitude of the force exerted on the ball by the floor?

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.