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6. Mary and Sally are in a foot race. When Mary is 22 m from the finish line, she has a
speed of 4.0m/s and is 5.0 m behind Sally, who has a speed of 5.0m/s. Sally thinks
she has an easy win and so, during the remaining portion of the race, decelerates at a
constant rate of 0.4m/s^2 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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