A boy weighing 50 kg eat some bananas. The energy content of the bananas is 1000 cal. If the boy uses all of this energy to jump upwards from the ground, then the height up to which his centre of mass will rise is [mechanical equivalent of heat = 4. 2 J cal -1 , g = 10 m s -2 ]
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8.4
Energy used by the boy is
E=1000 x4.2J
4200 = 50 x 10 x h
h = 8.4m
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