a boy of mass 50 kg run up a staircase of 45 step in 9 seconds if the height of each step is staircase is 15 cm find the power of the boy
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Given, mass of body, m = 50 kg
h = 45 x15 = 675 cm = 6.75 m
t = 9 s, g = 10 m
PE = mgh = 50 x 10 x 6.75 = 3375 J
Power of the body = PE / time = Energy / time = 3375 / 9 = 375 W
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