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16 July, 20:09

If a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground, what is the final velocity of the stone? A. 39.2 m/s B. 42.6 m/s C. 78.4 m/s D. 156.8 m/s

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  1. 16 July, 23:51
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    Getting the final velocity of a free fall, we need to use this formula:

    vf = g * t

    where

    g = 9.8 m/s^2

    t = time

    From the problem given, the final velocity of the stone is

    vf = g * t

    vf = 9.8 m/s^2 * 8 s

    vf = 78.4 m/s

    So the correct answer is letter C. 78.4 m/s
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