Consider a boundary-layer velocity profile:
\[ \frac{u}{U} = \begin{cases} \left( \frac{y}{\delta} \right)^2 & y \le \delta \\ 1 & y > \delta \end{cases} \] The shape factor (ratio of displacement thickness to momentum thickness) is \(\underline{\hspace{2cm}}\) (round off to 2 decimal places).