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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?

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