The power of a motor pump is 60 W Find the mass of water, the pump can lift per minute from a 10 m deep well.

(Take, g = 10 ${{ms}^{-2}}$)

Given, power, A = 60 W, time, t =60 s Height, h = 10m

Energy supplied to the pump = Power X Time

= 60 W x 1 min [v 1 min = 60 s] = 60 Wx 60s = 3600 Ws= 3600J So, energy,

E = mgh =>

3600 = m X 10 X 10

=> m = 36 kg

So, mass of the water is 36 kg.