Q. What power must a sprinter, weighing 80 kg, develop from the start if he has to impart a velocity of $10\ ms^{- 1}$ to his body in 4 s?
A) 1 kW
B) 2 kW
C) 3 kW
D) 4 kW
Explanation
(a) $P = \frac{mv^{2}}{2t} = \frac{80 \times 10 \times 10}{2 \times 4} = 1000\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.