Answer
$65.86\;W$
Work Step by Step
The power of the pump is equals to the total energy (kinetic energy+potential energy) of the water passing through the window per unit time. Therefore, the pump’s power is
$P=\frac{1}{2}\rho_w(5\times\pi\times0.01^2)\times5^2+ \rho_w(5\times\pi\times0.01^2)\times9.81\times3$
or, $P=1000\times(5\times\pi\times0.01^2)\times(\frac{1}{2}\times25+9.81\times3)\;W$
or, $\boxed{P=65.86\;W}$
