A race car traveling at 44 m/s is uniformly decelerated to a velocity of 22 m/s in 11 seconds, what is the race car's acceleration? [**Uniform deceleration means that it slows down at a constant rate.]

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.