A Foul Ball Is Hit Straight Up into the Air

Short Answer

A foul ball is hit straight up into the air with a speed of 30.0 m/s.
(a)Calculate the time required for the ball to rise to its maximum height.
(b)Calculate the maximum height reached by the ball.
(c)Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball.
(d)Explain why there are two answers to part (c).