An automobile and train move together along parallel paths at 20.7 m/s.
The automobile then undergoes a uniform acceleration of -4 m/s2 because of a red light and comes to rest. It remains at rest for 46.7 s, then accelerates back to a speed of 20.7 m/s at a rate of 2.36 m/s2.
How far behind the train is the automobile when it reaches the speed of 20.7 m/s, as- suming that the train speed has remained at 20.7 m/s?