Question

A woman pulls a bucket of water total mass 5kg from a well which is 10m deep in 10sec. Calculate the power used by her

Answer 1

Work done = Gain in potential energy = mgh = 5*9.8*10 = 490J
Power = Work done/Time = 490/10 = 49 W

Answer 2

Answer:

WORK DONE IS 49 W

Explanation:

Mass m = 5 kg

Height h = 10 m

Time taken, t = 10 s

Acceleration due to gravity, g = 9.8 m/s^2

Total work done = Change in potential energy = mgh = 5 kg x 10 m x 9.8 m/s^2 = 490 J

Power = Work done / Time taken = 490 J / 10 s = 49 W