An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Given,

distance = 100m

time = 10s

$\mathrm{speed}=\frac{\mathrm{distance}}{\mathrm{time}}=\frac{100}{10}=10\mathrm{m}/\mathrm{s}$

Thus kinetic energy = $\frac{1}{2}m{v}^2$

A man's weight might range from 40 kg to 100 kg.

Thus, the kinetic energy could be between,

${\mathrm{KE}}_{\min }=\frac{1}{2}\times 40\times {10}^2=2000\mathrm{J}$

${\mathrm{KE}}_{\max }=\frac{1}{2}\times 100\times {10}^2=5000\mathrm{J}$

Hence the correct answer is 2000J - 5000J.