11.141 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 accelera- tion of B relative to A. 11.142 At a given instant in an airplane race, airplane A is flying horizon- tally in a straight line, and its speed is being increased at the rate of Dis flying at the same altitude as airplane A and C 678 Kinematics of Particles B 300 m 200 km/h Fig. P11.141 50° 240 km/h A 11.141 R Ca sh ST sh ti 11.142 A ta 8 as K at Ve