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2015-02-25T16:30:17+05:30

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given that ,
work done = 5000 j ( W )
time take = 20 minutes 
 power =  work done / time 
           = 5000 / 20 * 60  
            = 4.17 w ( answer )

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2015-02-26T23:06:26+05:30
Work=5000J
Time=20 min=20X60sec=1200sec
Answer=4.17W
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