A man has power of 90 wt.and mass 60 kg runs up a stair case in 40 second. If each step of stairs case of 20 cm high.Calculate the number of the steps.
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Let the number of steps be x,
then ;
Height = h = 20x cm = 0.2x m
Time = 40 sec
Mass = 60 Kg
Power = 90 Watt
Power = Work done/Time
power = mgh/t
90 = (60×10×0.2x)/40
120x = 3600
x = 360/12
x = 30
=======================
Hence the number of steps is 30
then ;
Height = h = 20x cm = 0.2x m
Time = 40 sec
Mass = 60 Kg
Power = 90 Watt
Power = Work done/Time
power = mgh/t
90 = (60×10×0.2x)/40
120x = 3600
x = 360/12
x = 30
=======================
Hence the number of steps is 30
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By Akash Gupta King
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