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Average Velocity in 2D Motion

Find the mass...

Question

Find the mass of a body which has $5 J$ of kinetic energy while moving at a speed of $2 m / s$ .

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Solution

$K E = \frac{1}{2} m v^{2}$
$m = \frac{2 K E}{v^{2}} = \frac{2 \times 5}{4} = 2.5 k g$

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