Question

a body mass 45kg climbs up 20steps in 20 seconds if each step is 25 cm high calculate the power used in climbing. take g=10m/s

Answer 1

Power is defined as the rate of doing work.
Now, m = 45 kg,
n = 20,
t = 20 s,
h = 0.25 x 20 = 5 m
P = W / t = mgh / t
= (45 x 10 x 5)/20
= 112.5 W

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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