1.141 Race car A is traveling on a straight portion of the track while race car B is traveling on a circular portion of the track. At the instant shown, the speed of A is increasing at the rate of 10 m/s², and the speed of B is decreasing at the rate of 6 m/s². For the position shown, determine (a) the velocity of B relative to A, (b) the acceleration of B relative to A. 200 km/h Fig. P11.141 300 m 50° 240 km/h A