Question

If the flare is launched with an initial velocity of 144 feet per second, find the height after 2 seconds. The answer is not 288!

Answer 1

The height = 223.6 ft

Explanation:

∵ Initial velocity (u) = 144 ft/sec

∵ t = 2 sec

∵ a = - 32.2 ft/sec²

∵ h = ut + 1/2 at²

∴ h = 144(2) +1/2 (-32.2 × 4) = 288 + 1/2( -128.8) = 223.6 ft