A tennis ball is thrown vertically upward from the ground and the ball is seen to pass the

a tennis ball is thrown vertically upward from the ground and the ball is seen to pass the top of a building with a vertical speed 18.0 m/s. if the height of the building is 145 m, nd: a) the initial speed of the tennis ball, b) the maximum altitude reached by the tennis ball, and c) the time taken by the ball to reach the ground again.