Halliday, Resnick & Walker — Motion Along a Straight Line: Problem 34

34 In Fig. 2-18, a red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at \( x_{r} = 0 \) and the green car is at \( x_{g} = 220 \text{ m} \). If the red car has a constant velocity of 20 km/h, the cars pass each other at x = 44.5 m, and if it has a constant velocity of 40 km/h, they pass each other at x = 77.9 m. What are (a) the initial velocity and (b) the constant acceleration of the green car?