Work Energy Power

JEE Main level, single correct, medium

134 of 183

Question 134 of 183

An athlete in the olympic games covers a distance of 100 m100 \mathrm{~m} in 10 s10 \mathrm{~s}. His kinetic energy can be estimated to be in the range

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Answer: (D) 2,000 J−5,000 J2,000 \mathrm{~J}-5,000 \mathrm{~J}

Approximate mass =60 kg=60 \mathrm{~kg}
Approximate velocity =10 m/s=10 \mathrm{~m} / \mathrm{s}
Approximate KE=12×60×100=3000 J\mathrm{KE}=\frac{1}{2} \times 60 \times 100=3000 \mathrm{~J}
KE\mathrm{KE} range ⇒2000\Rightarrow 2000 to 5000 joule

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