Question

A girl of mass 50kg runs up a flight of stairs.After 10 minutes she is 250 metres above the ground. Determine her average power output. Ignore the effects of friction.

Answer 1

Power = work done / time
Work done
=mgh
=50*9.8*250
=122500 J
Time
=10*60 s
=600 s
Power
= work done /time
=122500/600 J/s
= 204.2 W

Answer 2

Ep=50*9.8*250
Ep = W
time=60*10
=600s
P= W/t
=122500/600
=204,166W •04