A runner on a 100-m dash starts from rest and then accelerates to his maximum speed of 10.0 m/s to 4.00 s. He then continues with his speed until the end of the race.
a. How many seconds after he starts does the runner finish the race?
b. How far from the starting line is the runner at t = 4.00 s
c. What is the average speed of the runner for the entire race
d. If, upon the crossing the finish line, the runner immediately decelerates at a rate of 2.00 m/s^2, how far from the finish line will the runner stop?

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