Mary and Sally are in a foot race. When Mary is 22m from the finish line, she has a speed of 4.0 m/s and is 5.0m 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 0.36 m/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? Express your answer to two significant figures and include the appropiate units.