1. The problem statement, all variables and given/known data A world-class sprinter accelerates to his maximum speed in 3.8 s. He then maintains this speed for the remainder of a 100-m race, finishing with a total time of 10.4 s. (a) What is the runner's average acceleration during the first 3.8 s? (b) What is his average acceleration during the last 6.6 s? (c) What is his average acceleration during the entire race? (d) State why your answer to part (c) is not the average of the answers to parts (a) and (b). 2. Relevant equations Kinematic Equations 3. The attempt at a solution I know that part b is 0 because the runner maintains a constant velocity. But for parts a, c, and d, I'm not sure what to do. I know I have to find the distances he runs while his speed changes and when it is constant and then find the acceleration, but how do I do this? Thank you so much for your help!!