At the instant shown, cars A and B are traveling at speeds of 55 mi/h and 40 mi/h, respectively. If B is increasing its speed by 1200 mi/h^2, while A maintains a constant speed, determine the velocity and acceleration of B with respect to A. Car B moves along a curve having a radius of curvature of 0.5 mi. (Both cars start at the same location, Car A is traveling to the left along the x-axis, and Car B is traveling to the left at an angle of 30 degrees from the x-axis and above the hoizontal.)