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10 March, 00:33

A rock breaks loose from a cliff and plunges toward the ground 400 feet below. The distance "d" that the rock falls in "t" seconds is given by the equation d=16t^2. How long does it take the rock to hit the ground?

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  1. 10 March, 01:34
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    The distance the rock has to travel to hit the ground is 400ft.

    400 = 16 * t^2divide both sides by 16 and take the square root.

    25=t^2

    5=t
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