Question

How much power does a boy of 45kg mass who climed a stair with 10steps and 1step in 5cm high in 20 second g=10m/s

Answer 1

Answer:

Hence, Power used by boy = 114.5 W

Step-by-step explanation:

We know that ,

Power = Work / Time => P = W / T

And,

Work = mgh

Here its given that,

m = 45kg

g = 10m/s²

h = 25 × 20 = 500cm = 5m

Then,

Work = 45 × 10 × 5 = 2250J

Now, power,

P = W / T

P = 2250 / 20 = 114.5W

Hence, Power used by boy = 114.5 W