Mary and Sally are in a foot race (Fig. 2-43). WhenMary is
Chapter 2, Problem 2.47(choose chapter or problem)
Mary and Sally are in a foot race (Fig. 2-43). WhenMary is 22 m from the finish line, she has a speed of 4.0 m/sand is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sallythinks she has an easy win and so, during the remainingportion of the race, decelerates at a constant rate of0.50 m/s2 to the finish line. What constant acceleration doesMary now need during the remaining portion of the race, ifshe wishes to cross the finish line side-by-side with Sally?
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