# 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 $P_{atm}$.

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

$V=\sqrt{2gh}$
$V=\sqrt{2\times 10\times 8}$
$\;\;\;=\sqrt{160}$
$\;\;\;=12.52m/s$
Hence (B) is the correct answer.