A man of mass 80kg ascends 30 steps of a staircase in 15 seconds. If
the height of each steps of the staircase is 20cm, find the power of
man. [g=9.8 m/s
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Answer:
Given,
Time, t=15sec
height of each stair, s=0.2m
Displacement, d=N×s=25×0.2=5m
Total weight, W=(man mass+load mass)g=(80+25)×9.8=1029N
Power,P=
total time
change in potential energy
P=
t
Wh
=
15
1029×5
=343 W
Power is 343W
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