A ball of mass 0.1 kg is dropped from a height of 2 m onto a hard surface. If rebounds to a height of 1.5 m and it is in contact with the surface for 0.05s. Calculate the:
(a) speed with which it strikes the surface.
(b) speed with which it leaves the surface.
(c) change in momentum of the ball.
(d) impules given to the ball on contact with the surface.
(e) average force that the surface exerts on the ball.