3. Velocity profiles are measured at the upstream end (surface 1) and at the downstream end (surface 2) of the control volume shown in figure below. Surfaces 3 and 4 are streamlines. If the flow is incompressible, two dimensional, and steady, what is the drag coefficient for the airfoil? The vertical dimension HD =0.025c. The pressure is P(a constant) over the entire surface of the control volume. Hu Streamline Hp-0.025c -0.50 Streamline