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# A person weighing 70Kg wt lifts a mass of 30 Kg to the roof of a building 10 m high. If he takes 50 sec to do so,then the power spent is A. 19.6 W B. 196 W C. 300 W D. 50 W

Arun
25763 Points
one year ago
Total work done is equals to 70 + 30 into G into displacement
so work done is equals 100 into 9.8 into 10
therefore work done is equals 100 into 9.8 into 10 completely divided by 50 equals to 196 watt

Vikas TU
14149 Points
one year ago
The number of sigma and pi-bonds in 1-butene 3-yne are 7 sigma and 3 pi. It has one C=C double bond which contains one pi bond. It has one C≡C triple bond which contains two pi bonds. It has 3 carboTotal work done is equals to 70 + 30 into G into displacement
so work done is equals 100 into 9.8 into 10
therefore work done is equals 100 into 9.8 into 10 completely divided by 50 equals to 196 watt