A water tank is constructed on the top of a building with what speed will the water come out of a tank 8m below the water level the tank?Assume steady flow and that the pressure above the water level is equal to $P_{atm}$.

Question

$\begin{array}{1 1}(A)\;11m/s\\(B)\;12.52m/s\\(C)\;13.2m/s\\(D)\;.141m/s\end{array} $