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8 September, 17:07

At t=0, a rock is dropped from rest from the top of a building 256 ft high. With what velocity will it strike the ground? What is it acceleration

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  1. 8 September, 17:36
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    128 ft / second.

    Step-by-step explanation:

    It's acceleration is due to gravity and is 32 ft s^-2.

    To find the velocity when it hits the ground we use the equation of motion

    v^2 = u^2 + 2gs where u = initial velocity, g = acceleration, s = distance.

    v^2 = 0^2 + 2 * 32 * 256

    v^2 = 16384

    v = 128 ft s^-1.
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