A0.145-kg baseball pitched horizontally at 35.0 m/s strikes a bat and is popped straight up to a height of 40.0m. if the contact time between bat and ball is 2.5m/s, calculate the magnitude of the average force between the ball and bat during contact. express your answer using two significant figures.

Explanation:

Maximum height reached by the ball after being popped by the bat is given as

now we know by energy conservation final speed of the ball after being hit by the bat is given as

now the change in momentum of the ball is given as

now force is given as rate of change in momentum

so magnitude of the force is given as

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.