Solution 17.5a
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(New page: <math>\begin{align} & \text{Gain in KE }=\frac{1}{2}\times 3\times {{15}^{2}}-\frac{1}{2}\times 3\times {{3}^{2}} \\ & =324\text{ J} \end{align}</math>)
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\displaystyle \begin{align} & \text{Gain in KE }=\frac{1}{2}\times 3\times {{15}^{2}}-\frac{1}{2}\times 3\times {{3}^{2}} \\ & =324\text{ J} \end{align}
