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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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