please tell me the answer fast
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please tell me the answer fast
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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