Question

A person lifts a ball of mass 1 kg through the

height of 1 m in 10 s. The average power
supplied by him is [Take g = 10 m/s²]
(2) 1 W
(4) 2 W
(1) 10 W
(3) 0.1 W

Answer 1

1 W

Step-by-step explanation:

Power is the ratio of the total work done by the body to the time it will takes to do the work.

Therefore Power = total work done ÷ time

Total Work done = Potential energy (P.E) = mgh

Total work done = mgh

Total work done = 1kg × 10m/s² × 1m

Total work done = 10 J

Therefore Total Work done is 10J.

And then time is 10 s.

Power = Total Work done divided by time

Power = 10 J÷ 10 s = 1 W

Therefore Power is 1W