# Energy conservation applied to a stone dropped from a height

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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#### Solution Preview

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>

<br>therefore PE = 980 x m

<br>

<br>This is ...

#### Solution Summary

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