Question

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

Answer 1

hey there

here is your answer

we know that ,

power = work / time

work = mgh

m = 45kg

g = 10m/s²

h = 25 * 20 = 500cm = 5m

work = 45 * 10 * 5 = 2250J

P = W / T

P = 2250 / 20 = 114.5W

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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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