Answers

2016-02-09T15:46:49+05:30
work = mass * displacement
w = 500*80
w= 400000 J 
Power = energy/time
P = 500*10*80/10
P= 40000 W
P = 40 kW...
power rating = useful power / efficiency 
                       = 40/40/100
                       =100 kW.........
i hope it helps.......
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