Please answer all the three question!

A crude approximation for the x-component of velocity in a two-dimensional, incompressible boundary layer is a linear variation from u = 0 at the surface (where y = 0) to the free stream velocity, U, at the edge of the boundary layer (where y =  ). The equation for the profile is ???? = ????????/???? where ???? = ????????1/3 and c is a constant.