Question

A boy of mass 45 kg climbs up 20 steps in 20 sec. If each step is 25cm high calculate the power of boy used in climbing

Answer 1

S=20*25=500cm=5m
t=20s
F=mg=45*9.8
power=45*9.8*5/20
=45*4.9/2
=110.25W
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Answer 2

Answer:

i) The rate of doing work is known as Power

ii) Power used in climbing = 112.5W

Explanation:

Given:

m=45kg

g = 10 m/s

h=20 × 25 = 500cm ⇒5m

t=20s

Solution:

We know that Work = mgh

and Power =Work/Time

⇒ Work = 45 × 10 × 5 = 2250J

⇒Power = 2250J/ 20s ⇒ 112.5W

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