Q. An athlete in the Olympic covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range
A) 200 J-500 J
B) $2 \times 10^{5}\ J - 3 \times 10^{5}\ J$
C) 20000 J$-$50000 J
D) $2000\ J - 5000\ J$
Explanation
(d) Question is somewhat based on approximations.
Let mass of athlete is 65 kg.
Approx velocity is 10 ${ms}^{- 1}$
So, $KE = \frac{65 \times 100}{2} = 3750\ J$
So, option(d) is most probable answer.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.