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A body falls freely under gravity. Its velocity is v when it has lost potential energy equal to U' . What is the mass of the body ?

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$2 U^{2} / v^{2}$

$U / v^{2}$

$U^{2} / v^{2}$

$2 U / v^{2}$

answer is C.

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Detailed Solution

$U = \frac{1}{2} {mv}^{2} or m = \frac{2 U}{v^{2}}$

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