1.

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)​

Answer»

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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