Question

if the mass of the box is 40 kg find pmin

Answer 1

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 =  W/ t

Power = 9000  / 25

Power =360Js  ^−1

Power =360 W

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Answer 2

Answer:

above answer is correct

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