a boy of mass 45 kg runs up a staircase of 45 steps in 9 sec. if the height of each step is 15 cm, find his power(g=10m,-2)
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Answer: 375 W
Explanation:
m=50kg
T=9s
g=10ms-²
F=mg
=50×10=500N
h=15m
Total height=45×15=675m
Therefore, S=675m
W=F×S=500×675=3375J
P=W/T=3375/9=375W
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