Answer
$m=\frac{2E}{v^2}$
Work Step by Step
$E=\frac{1}{2}mv^2$
$m=\frac{E}{\frac{1}{2}v^2}$
$m=\frac{E}{v^2}\frac{2}{1}$
$m=\frac{2E}{v^2}$
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