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Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
Here given, mass of the body $m=100\ g=\frac{100}{1000}\ kg=\0.1\ kg$
Kinetic energy $K=20\ J$
Let $v$ be the velocity of the body.
Therefore, $\frac{1}{2}mv^2=20$
Or $mv^2=20\times2$
Or $0.1\times v^2=40$
Or $v^2=\frac{40}{0.1}$
Or $v^2=400$
Or $v=\sqrt{400}$
Or $v=20\ m/s$
Therefore, the momentum of the body $p=mv$
$=0.1\times 20$
$=2\ kg-m/s$
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