Answer:
Given that ,
A man whose mass is 50kg climbs up 30 steps of a stair in 30s
each step is 20 cm high
Height at 30 steps , h=30×0.2=6 m
Change in potential energy , =mgh=50×10×6=3000 J
So, Work done by the man , W=3000 J
Power used , P=
t
W
=
30
3000
=100 W
Step-by-step explanation:
