Question

A body having $5kg$ mass is travelling with a certain velocity and has $10kgm/s$ momentum. What is its kinetic energy?

• A. 50 J
• B. 100 J
• C. 10 J
• D. 2 J

Answer 1

The correct option is C

10 J

Momentum can be calculated as, $P=m\times vandK.E=\frac{1}{2}m\times v^2=\frac{\left({m^2\times v}^2\right)}{2\times m}=\frac{\left({momentum}^2\right)}{2\times mass}$

= $\frac{100}{10}=10J$