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    Energy conservation applied to a stone dropped from a height

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    A stone is dropped from a height of 100m. At what height is half of its energy potential and half kinetic? What is the speed of the stone at this height?

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    Let m be the mass of the stone
    <br> the potential energy at a height of 100 meters
    <br>PE = m x g x 100
    <br>g =9.8m/s^2
    <br>therefore PE = 980 x m
    <br>This is ...

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