Question

please tell me the answer fast ​

Answer 1

Answer:

given:

a boy whose mass is 50kg climbs up 30 steps of a stair 30s.

each step is 20cm high.

height at 30 steps , h=30×0.2=6m

change in potential energy= mgh= 50×10×6 =3000j

so, work done by the boy ,w = 3000j

power used ,p = w= 300 = 100w

t 30