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 (a) 200 J - 500 J (b) 2 × 10⁵ J - 3 × 10⁵ J (c) 20,000 J - 50,000 J (d) 2,000 J - 5,000 J

Answer: (d). Average speed v = 100/10 = 10 m/s. An athlete's mass is about 40 to 100 kg. K = 1/2mv² ≈ 1/2(40 to 100)(100) = 2000 to 5000 J So the answer is (d).

An athlete in the Olympic games covers a distance of 100 m in 10 s… | JEE Main 2008 (AIEEE)

Q16JEE Main 2008 · AIEEEEasy

Kinetic Energy & Momentum

An athlete in the Olympic games covers a distance of $100\text{ m}$ in $10\text{ s}$ His kinetic energy can be estimated to be in the range

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Answer: (d)

Average speed $v = \frac{100}{10} = 10\text{ m/s}$ .
An athlete's mass is about 40 to 100 kg.
$K = \frac{1}{2}mv^2 \approx \frac{1}{2}(40\text{ to }100)(100) = 2000\text{ to }5000\text{ J}$
So the answer is (d).

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