calculate the horse power of the motor of an elevator ,which can carry 10 persons of average mass 60 kg through a vertical height of 20 m in 30 sec.
take g=10N/Kg
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power = work time
work =m.g.s.
=600*10*20
power =600*10*20/30
=400watt
work =m.g.s.
=600*10*20
power =600*10*20/30
=400watt
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