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The first 10 meters of a 100 meter dash are covered in 2 seconds by a sprinter who starts from rest and acceleraties with a constant acceleration. The remaining 90 meters are run with the same velocity the stprinter had after 2 seconds.

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

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

c) Determine the total time needed to run the full 100 meters.

What I don't understand is the 'accelerates with a constant acceleration' part. All I did to solve that part was solve for the average acceleration, which I think is wrong.

I ended up getting 2.5 m/s^2 for the acceleration.

Could anyone tell me whether or not I'm on the right track, or if I'm totally wrong, just point me in the right direction.