Solve the all parts of following question:
Question: A world-class sprinter accelerates to his maximum speed in 4.2s. He then maintains this speed for the remainder of a 100-m race, finishing with a total time of 9.3s.
Part A: What is the runner's average acceleration during the first 4.2s?
Part B: What is his average acceleration for the entire race?
I need help to determine his average acceleration for the entire race.