Tina and Harry are running a 10 km race. When Tina is 25.0 m from the finish line she has a velocity of +2.17 m/s and is 8.00 m behind Harry who has a velocity of +3.70 m/s. Harry thinks he is winning and so, during the remaining portion of the race he slows down at a rate of 0.356 m/s2. What acceleration (in m/s2) does Tina need during the last 25.0 m of the race in order to cross the finish line at the same time as Harry