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Kinetic Energy

A body of mas...

Question

A body of mass m is travelling with velocity v. How much work should be done on it to bring it to rest?

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Solution

As per work-energy theorem,
Work done = Change in kinetic energy
$= 0 - \frac{1}{2} m v^{2} = - \frac{1}{2} m v^{2}$

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