Question

With what velocity should a student of mass 60 kg run so that the kinetic energy becomes 480 J ?​

Answer 1

Answer:

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Answer 2

Answer:

Explanation:

Given, mass of the man, m = 60kg

Kinetic energy of the man, $E_{k} = 480 J$

If v is the velocity of the man, then

$E_{k} =\frac{1}{2} mv^{2}$  or

$v=\sqrt \frac{2E_{k} }{m}$

 $= \sqrt\frac{2\times480}{60} }$

$=\sqrt\frac{960}{60}$

 $= \sqrt{16}$

$= 4$ m/s