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2015-04-12T00:59:47+05:30

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M =1 0 kg
height h = 50 m

It travels with an initial velocity of 15 m/sec.  u = 15 m/s

its initial potential energy = m g h = 10 kg * 9.81 m/sec² * 50 m
           = 4, 905 Joules

Initial kinetic  energy = 1/2  m v² = 1/2 * 10 kg * 15m/s)² = 1, 125 Joules

Initial total energy = 4 905 + 1125 = 6, 030 JOules

The total energy remains constant.  When the body touches the ground, the potential energy is converted into the kinetic energy.
   so PE = 0, and KE = 6, 030 joules.

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