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30 January, 15:37

A stone is thrown upward from ground level. With what minimum speed should the stone be thrown so as to reach a height of 36 feet?

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  1. 30 January, 17:47
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    V^2 = u^2 - 2gh; where v is the final speed, u is the initial speed, g = 9.8 m/s = 0.54 ft/min is the accerelation due to gravity, h = height.

    At the maximum height, the final speed is 0.

    u^2 = 2gh = 2 x 0.54 x 36 = 38.58

    u = sqrt (38.58) = 6.21 ft/min

    Therefore, the stne should be thrown with 6.21 ft/min
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