Water falls from a height of 60m at rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of energy. How much power is generated by the turbine? ($g =10 m/s^2$)

Given  $h=60m,g=10m{s}^{-2}$
Rate of flow of water=15kg/2
Power of the falling water
 $=15kg{s}^{-1}\times 10m{s}^{-2}\times 60m=900watt$
Loss in energy due to friction
 $=9000\times \frac{10}{100}=900watt$
Power generated by the turbine

$=(9000-900)watt=8100watt=8.1kw$