A ball is thrown verically upwards from the top of the tower with a speed of 100 m/s. It strikes the pond near the base of the towerafter 25 second. The height of tower is
h = -1/2 g t^2 + 100 t + Ht
0 = (-4.9 * 25^2) + 2500 + Ht
0 = (-4.9 * 25^2) + 2500 + Ht