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• (cur) (last) 11:59, 4 October 2010 Ian (Talk | contribs) (302 bytes) (New page: The energy is constant. Thus the energy in the beginning is equal to the energy at the end. <math>\begin{align} & \frac{1}{2}\times m\times {{18}^{2}}=\frac{1}{2}\times m\times {{12}^{2}}...)

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