PLEASE ANSWER $9\mathrm{.}10$

$9\mathrm{.}7$ Use the momentum integral and the velocity profile

$\frac{u}{U}=a+b\frac{y}{}$

to evaluate the boundary$-$layer thicknesses ${}^{**}$ and $$ and the surface shear stress ${}_0$ for flow over a flat surface.

$9\mathrm{.}10$ Repeat Problem $9\mathrm{.}7$ using the following velocity distribution, in which $$ is a constant:

$\frac{u}{U}=1-e^{-\frac{y}{}}$