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Energy

A boy of mass...

Question

A boy of mass 18 kg is running with a speed of 2 km/h. Find the kinetic energy possessed by the boy.

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Solution

$v = 2 k m / h = 2 \times \frac{5}{18} m / s m = 18 k g k i n e t i c e n e r g y = 0.5 \times 18 \times {(\frac{5}{18})}^{2} = 156.25 J o u l e$

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