Solution 17.6a
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(New page: Image:17.6.gif From the figure, <math>\begin{align} & PE=5\times 9\textrm{.}8(8-8\cos 30{}^\circ ) \\ & =52\textrm{.}5\text{ J} \end{align}</math>)
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From the figure,
\displaystyle \begin{align} & PE=5\times 9\textrm{.}8(8-8\cos 30{}^\circ ) \\ & =52\textrm{.}5\text{ J} \end{align}
