A machine dose a work of 25 kg in 3 minutes 20 second.
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Answer:
Weight of boy =40kg
Weight of box =20kg
Total weight (mg)=60×10=600 N
Height (h)=15m
Time (t)=25s
Increase in potential energy =mgh
Increase in potential energy =600×15
Increase in potential energy =9000 J
We know that enrgy is equal to work done and vice versa
Therefore Work Done (W)=9000 J
Power =
t
W
Power =
25
9000
Power =360Js
−1
Power =360 W
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