Velocity through the nozzle

The kinetic energy of the jet at an outlet of nozzle =$\dfrac 12mv^2$

Now the mass of liquid at the outlet of nozzle per second = $\rho av$

$\therefore $ Kinetic energy of the jet at the outlet per sec

$=\dfrac 12\rho av\times v^2$

$=\dfrac 12\rho …