$9\mathrm{.}2\mathrm{.}20$ WP Consider $20C$ water flowing over a thin, wide, smooth flat plate aligned with the flow. The approach velocity is $60k\frac{m}{h}r$ and the Reynolds number based on the plate length is $2{10}^5.$ Calculate the drag per unit width of the plate for each of the velocity profiles listed in Table $9\mathrm{.}2.$ Next determine the drag coefficient $C_D$ as used in Fig. $9\mathrm{.}15.$ Which velocity profile$($s$)$ provide the best estimation of $C_D?$ Why?