A toy car rolls along a curved track as shown below. The track has a tall incline that gradually slopes downward to a ramp that makes a 40 angle with the horizontal. The car is placed at point A, at the top of the track, and has initial speed v_A when it is at point A. It exits the track at point B with speed v_B. Assume that the rotational kinetic energy of the car's wheels and energy losses due to friction are both negligible.