Problem 3-4 At the instant shown, car A has a speed of 20 km/h, which is being increased at the rate of 300 km/h² as the car enters an expressway. At the same instant, car B is decelerating at 250 km/h while traveling forward at 100 km/h. Determine the velocity and acceleration of car A with respect to car B. (Ans: 120 km/h 4, 4000 km/h², 0.716°) DO 100m