$4.$ Consider a laminar boundary layer on a flat plate with uniform suction velocity $\backslash ($ V$\_\{0\}\backslash )$ as shown in fig. $4.$ Far down the plate $($large $\backslash ($ x $\backslash )),$ a fully developed situation may be shown to exist. In this region, starting from general 'boundary layer equations' deduce an expression for $($a$)$ velocity distribution and $($b$)$ wall shear stress. One of the boundary conditions $($in addition to other conditions as seen from the Fig $4.)$ you can use is: At $\backslash ($ y$=\backslash$infty ; u$=$U $\backslash ).$