Question

The first meters of a 100-meter dash are covered in 2 seconds by a sprinter who starts from rest and accelerates with a constant acceleration. The remaining 90 meters are run with the same velocity the sprinter had after 2 seconds.

a. Determine the sprinter's constant acceleration during the first 2 seconds.

b. Determine the sprinter's velocity after 2 seconds have elapsed.

-- I believe the velocity is 5m/s since the question implies that the sprinter ran 10 meters in 2 seconds. This is my first day in physics, and I really don't understand how to complete this question.

Answer 1

No, his average velocity was 5m/s. He started at zero, had constant acceleration, so he had to be at 10m/s at the end (so his average was 5m/s)