12 223 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 h2 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 28 40 mi h ROXO 30 V 55 mi h Prob 12 223