Lift on an Airplane Air streams horizontally past a small airplane's wings such that the speed is 70.0 m/s over the top surface and 60.0 m/s past the bottom surface. If the plane has a wing area of 16.2 ul- on the top and on the bottom what is the net vertical force that the air exerts on the airplane? "The density of the air is 1.20 kg/m3.