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7 November, 22:04

A stone falls 36.0m (120ft).

How long did it take the stone to hit the ground? How fast was the stone moving on impact ft/sec? m/sec?

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  1. 8 November, 01:40
    0
    Assume the stone was falling on Earth and started at rest.

    Initial velocity (v) = 0 m/s

    Final velocity (V) = ?

    Acceleration (g) = 9.81 m/s^2

    Distance (d) = 36 m

    Time (t) = ?

    For the first part:

    d = v*t+0.5*a*t^2 = 0.5*a*t^2 = 4.9*t^2 = 36

    Solve for t: t = 2.7 sec

    For the second part:

    V^2 = v^2+2*a*d = 2*a*d = 2*9.81*36 = 706.32

    Square root for V: V = 26.6 m/s
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