In Fig. 4-34, a stone is projected at a cliff of height h with an initial speed

In Fig. 4-34, a stone is projected at a cliff of height h with an initial speed of 42.0 m/s directed at angle above the horizontal. The stone strikes at A, 5.50 s after launching. Find (a) the height h of the cliff, (b) the speed of the stone just before impact at A, and (c) the maximum height H reached above the ground.