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18 November, 23:32

A ball is thrown straight up from the ground with an unknown velocity. It returns to the ground after 4.0seconds. With what velocity did it leave the ground?

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  1. 19 November, 00:13
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    V = 1/2at^2

    a = 9.8 m/2^2 (constant)

    t = 4.0 s

    1/2 • 9.8 • 4^2

    1/2 • 9.8 • 16

    = 78.4 m/s
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