A 40kg boy runs up a staircase to a floor 5 m higher in 7 s. His power output is?

Question:a. 29 W
b. 280 W
c. 1.4 kW
d. 13.7 kW

Work done going up 5 metres (Potential energy) = mgh = 40*5*9.8

Power = Work done/unit time = 40*5*9.8/7
= 280 W

(b) is the answer

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