Question

an electric pump has 2 kw power.how much water will the pump lift every minute to a height of 10 m?

Answer 1

power=2×10^3J/s
=2000J×60/min =12000J/min
that means pump is efficient to work 12000J
per minute.
work done to lift m mass to hight 10m=mgh
=m×10×10=100m
so,
12000 =100m
m=120kg=120litre