A runner is training for an upcoming road race and sets out for a weekend endurance run. In order to track the pace of the run, the runner records time splits for the entire period. This allows the runner to produce the pictured velocity versus time graph. The run is broken into six segments. 4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 Velocity (m/s) O 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100105 Time (min) O positive. zero. O flat. O negative. Calculate the average acceleration (magnitude and sign) of the runner during segments 2 and 5. a2 = m/s2 as = m/s2