The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. The lift of a wing with an area of 250 square feet is 13,400 pounds when the plane is going at 200 miles per hour. Find the lifting force if the speed is 140 miles per hour. Round your answer to the nearest integer if necessary. Answer Keypad Keyboard Shortcuts