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2014-11-20T22:31:23+05:30

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I think the weight is 50 kg   not  50 grams

initial kinetic energy = 1/2 m v² = 1/2 * 50 kg * (9 * 5/18 m/sec)²
                = 62.5  Joules
Final kinetic energy = 1/2 * 50 kg * (18 * 5/18 m/sec)²
              = 125 Joules 

Change in kinetic energy is = work to be done
              = 62.5 joules

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