The kinetic energy of a body of mass 2 kg and momentum 2 Ns is

1 J

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2 J

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3 J

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4 J

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Solution

The correct option is A 1 J
Given:mass(m) $= 2 k g$ , momentum(p) $= 2 N s$
we know; $p = m v$

$v = \frac{p}{m}$

$v = 1 m s^{- 1}$

Kinetic energy (K.E) $= \frac{1}{2} m v^{2}$ ,

$K . E = \frac{1}{2} p v$

$K . E = \frac{1}{2} \times 2 \times 1$

$K . E = 1 J$

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