Question

A boy of mass 55 kg climbs up 20 steps in 10 seconds each step begin 20 cm height calculate the power used by the boy in climbing the stairs

Answer 1

Answer:

P = 2250 / 20 = 114.5W. if you take g = 9.8 or 10 both are correct

Answer 2

Answer:

USING(g)=10m/s^2

Explanation:

mg=55kg×10m/s^2

mg=550N

Height(h)=20×20/100m

h=4m

Now,

power=mgh/t

p=550N×4m/10s

p=220Watt(W)