A 0.165-{\rm kg} baseball pitchedhorizontally at 40.0 {\rm m/s} strikes a bat and ispopped straight up to a height of 30.0 {\rm m}.
a) If the contact time between bat and ball is 3.0 {\rm ms}, calculate the magnitude ofthe average force between the ball and bat during contact.
b) Find the direction of the average force on the ball.