a boy of mass 40kg climbs a staircase of 30 steps, each of 0.2m height, in 30 s. calculate power. (g=9.8m/s2)
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2
30 steps each .2m height
Total h=6m
Change in energy(here potential)=
=Work
mgh = 40×9.8×6=235.2J
Power=W/t=7.84 watt
Total h=6m
Change in energy(here potential)=
=Work
mgh = 40×9.8×6=235.2J
Power=W/t=7.84 watt
janmansh:
but the answer is 78.4W
but the real ans is 8W
i don't know how
Answered by
1
w= mgh 40×30×0.2×9.8=2352 , p= w/t 2352/30 =78.4
suez
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