If a body has mass 2 kg and momentum 4 kg.m/s, then find its kinetic energy.

2 J

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8 J

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4 J

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6 J

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Solution

The correct option is C 4 J
If m be the mass of the body and p be the momentum of the body, the kinetic energy of the body is
$K E = \frac{p^{2}}{2 m} = \frac{4^{2}}{2 (2)} = 4 J$

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