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![\\\begin{aligned}&=\frac{1}{2} m u^{2}-\frac{1}{2} m v_{i}^{2} \\&=\frac{1}{2} m\left(v_{f}^{2}-v_{i}^{2}\right) \\&=0.5 \times 15.5\left(1105-7.5^{2}\right) \\w &=[589 \mathrm{J}]\end{aligned}$$](/tpl/images/0551/3386/8c672.png)
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