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An object of mass 1000 kg is travelling with a velocity 72 km/h. Calculate the work done to bring it rest.

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An object of mass 1000 kg is travelling with a velocity 72 km/h. Calculate the work done to bring it rest.

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m = 1000 kg

v = 72 km/h = 20 m/s

Work = difference of kinetic energy

= \(\frac{1}{2}\) mv2

= \(\frac{1}{2}\) × 1000 × 20 × 20 = 400000J

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