Find the kinetic energy of a body of mass $200 g$ moving with a speed of $20 c m / s$ .

200 J

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0.4 J

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0.004 J

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4 J

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Solution

The correct option is D $0.004 J$
Mass = $20 g$ or $0.2 k g$ , velocity = $20 c m / s$ or $0.2 m / s$
$K . E = \frac{m v^{2}}{2} = \frac{0.2 \times (0.2)^{2}}{2} = 0.004 J$

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