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7 August, 17:19

If you hold out your hand and drop a penny, about how long does it take to hit the floor?

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  1. 7 August, 17:45
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    The equation of motion can be

    h (t) = - 16t^2 + 4

    for a penny dropped from a height of 4 feet. Then h (t) = 0 for

    0 = - 16t^2 + 4

    t^2 = 4/16

    t = √ (1/4) = 1/2

    It takes about 1/2 second for the penny to hit the floor.
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