How fast should a man of mass 60 kg run so that his kinetic energy is 750 J ?

15 m / s

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50 m / s

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5 m / s

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25 m / s

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Solution

The correct option is C $5 m / s$
Given, mass of the man, $m = 60 k g$
Kinetic energy of the man, $E_{k} = 750 J$
If v is the velocity of the man, then
$E_{k} = \frac{1}{2} m v^{2}$
or $v = \sqrt{\frac{2 E_{k}}{m}} = \sqrt{\frac{2 \times 750}{60}} = 5 m / s$

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