A 50 kg man moved 25 steps up in 20 seconds. Find his power, if each step is 16 cm high. (100 W)
Difficulty: Easy
Solution:
Mass = m = 50 kg
Total height = h = $25 \times 16$ = 400 cm = $\frac{400}{100}$ m = 4 m
Time = t = 20 s
Power = P = ?
Power =$\frac{work}{time}$=$\frac{w}{t}$ = $\frac{mgh}{t}$
P =$\frac{(50\times 10\times 4)}{20}$
P = 100 W
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