# Answer to Question #65777 in Mechanics | Relativity for METRO

Question #65777

. Mary and Sally are in a foot race (Fig. 2). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.4 m/s2 to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line sideby-side with Sally?

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