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Answer:
3920 joules per second/3920 watts.
Explanation:
Given : mass = 40 kg ; height = 20 meters ; time = 2 seconds ; g = 9.8 m/s^2 ; Power = ?
Power is defined as the rate of doing work. The work done by the pump is equal to the gravitational potential energy expended by the pump. It is PE = mgh while Power is work ➗ time.
Solving for the power of the water pump
Power = mgh / t
Power = (40 kg * 9.8 m/s^2 * 20 m ) ➗ 2 s
Power = 3920 joules per second or 3920 watts.