What is the momentum of a body of mass 100 g, having a Kinetic Energy of 20J?

2 kg ms

^{- 1}

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\frac{1}{2}

kg ms

^{- 1}

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2 g cm s

^{- 1}

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none of these

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Solution

The correct option is B 2 kg ms $^{- 1}$
Kinetic energy is given by $\frac{1}{2} m v^{2} = 20$ as mass is 0.1kg. So $v = \sqrt{4} 00 = 20 m / s$ .
And momentum is given by m.v
So momentum is $2 k g m s^{- 1}$

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