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ICSE Class 8 Answered

compare the work done and power of pallavi and parul when both of them can lift the same bag of 20kg to a height of 50cm. in 2and 5 seconds respectively(Take g=10ms-2)
Asked by sujanasudheer37 | 10 Sep, 2018, 10:17: PM
answered-by-expert Expert Answer
workdone to lift the object = increase in potential energy = mgh
power = rate of workdone = workdone/time
 
Pallavi :-   workdone = 20×10×0.5 = 100 Joules ;  power = 100/2 = 50 Watts
Parule :-   workdone = 20×10×0.5 = 100 Joules ;  power = 100/5 = 20 watts
Answered by Thiyagarajan K | 11 Sep, 2018, 09:35: AM
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