Find the velocity of a body of mass $100\ g$ having a kinetic energy of $20\ J$.

Here given, mass of the body $m=100\ g=\frac{100}{1000}\ kg.=\frac{1}{10}\ kg.$

Kinetic energy of the body $K=20\ J$

Let $v$ be the velocity of the body.

Then, Kinetic energy $K=\frac{1}{2}mv^2$

Or $\frac{1}{2}mv^2=20$

Or $\frac{1}{2}\times\frac{1}{10}\times v^2=20$

Or $v^2=20\times20$

Or $v^2=400$

Or $v=\sqrt{400}$

Or $v=20\ ms^{-1}$

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Updated on: 10-Oct-2022

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