Mary and Sally are in a foot race (Fig. 2-39). 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 0.40 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 side-by-side with Sally?

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Finish Mary Sally 5.0 m/s 4.0 m/s i-5.0 m- -22 m- FIGURE 2-39 Problem 37.