A bullet is fired from a rifle with a velocity of $1000 m / s$ . Its momentum is $20 k g m / s$ . What will be its mass?

10 g

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20 g

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50 g

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100 g

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Solution

The correct option is C $20 g$
Given $:$
Momentum $= 20 k g m / s$
Velocity $= 1000 m / s$
We know $,$
$M o m e n t u m = m a s s \times v e l o c i t y$
$\begin{matrix} 20 k g m / s = m a s s \times 1000 m / s m a s s = \frac{20}{1000} k g = \frac{20 \times 1000}{1000} g = 20 g \end{matrix}$
Hence,
option $(B)$ is correct answer.

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