Mass of body (m) = 50kg
Height of each step of the staircase = 45steps × 15 = 675cm = 6.75m
Time = 9s
Potential energy = mgh
By substituting the values:
= (50 * 10 * 6.75)
Power of the body = Potentialenergy / Time
= 3375 / 9
Therefore, the power of the boy is 375W.
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