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19 February, 19:10

A stone is thrown straight up from the edge of a roof, 775 feet above the ground, at a speed of 16 feet per second. A. Remembering that the acceleration due to gravity is - 32ft/sec2, how high is the stone 4 seconds later?

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  1. 19 February, 21:02
    0
    435 ft off the ground

    Step-by-step explanation:

    Use

    s = u t + 1/2 at²

    Here

    s = distance traveled

    u = initial velocity

    t = time

    a = acceleration

    putting values in equation

    = 16 * 4 + 1/2 32 * 16

    = 64 + 256

    = 320

    So the stone is

    775 - 320 = 435 ft off the ground
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