In Fig. 4-34, a stone is projected at a cliff of height h with an initial speed of
42.0m/s directed at angle
theta0=60.0° above the horizontal. The stone strikes at
A,
5.50s 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.