Q. The momentum of a body increases by 20%. The percentage increase in its kinetic energy is
A) 20
B) 44
C) 66
D) 88
Explanation
(b) $\frac{E_{k^{'}}}{E_{k}} = \left( 1 + \frac{1}{5} \right)^{2} = \frac{36}{25}$
$\left( \frac{E_{k^{'}}}{E_{k}} - 1 \right) \times 100 = \left( \frac{36}{26} \right) \times 100 = 44$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.