Secretariat won the Kentucky Derby with times

Secretariat won the Kentucky Derby with times for successive quarter-mile segments of 25.2 s, 24.0 s, 23.8, and 23.0 s.
(a) Find his average speed during each quarter-mile segment.
(b) Assuming that Secretariat’s instantaneous speed at the finish line was the same as the average speed during the final quarter mile; find his average acceleration for the entire race. (Horses in the Derby start from rest.)

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