An incompressible fluid flows horizontally in the \(x-y\) plane with a velocity given by

\[ u=30\left(1-e^{-4 \frac{y}{\hbar}}\right) \mathrm{m} / \mathrm{s}, v=0 \]

where \(y\) and \(h\) are in meters and \(h\) is a constant. Determine the average velocity for the portion of the flow between \(y=0\) and \(y=h\).