Question

A body having $10kg$ mass is traveling with a certain velocity and has $20kgm{s}^{-1}$ momentum. Calculate its kinetic energy (in Joule)?

• A. 20

Answer 1

The correct option is A 20
Given, mass of the body, m $=10kg$
and momentum,p $=20kgm{s}^{-1}$.

Kinetic Energy $=\frac{({\text{Momentum)}}^2}{2\times \text{Mass}}$
$=\frac{p^2}{2m}$
$=\frac{{20}^2}{2\times 10}$ $=20J$.