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2015-04-08T15:36:39+05:30

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KE of the missile at 850 m height :  1/2 m v²
     = 1/2 * 75 kg * 60² (m/s)²  =  135 kJ
Potential energy = PE = m g h = 75 kg * 9.81 m/sec² * 850 m
       = 625.3875 kJ

Total energy = 760.3875 kJ        add the PE and KE.

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