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A stone is projected at an initial speed of 120 ft/s directed 62° above the horizontal, at a cliff of height h, as shown in Fig. The stone strikes the ground at A 5,5 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. A stone is projected at an initial speed of 120 ft/s directed 62° above the horizontal, at a cliff of height h, as shown in Fig. The stone strikes the ground at A 5,5 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.
(c)The maximum height H is:Round off to two significant figures,H = 174 ftTherefore, the maximum height attained by the stone relative to ground is 174 ft .Therefore, the stone takes 1.2 s to move from point H to A.Therefore, the height of the cliff is 96 ft. .Round of to two significant figures,Therefore, the speed of the stone just before it hits the cliff is 91 ft/s .
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