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a. Determine the sprinters constant acceleration during the first 2 seconds. I got 5 m/s

b. Determine the sprinters velocity after 2 seconds have elapsed. I couldn't decide on 5 m/s^2 or 10 m/s^2 because i used Vf=Vo+at and V=d/t and it gave me those two different answers.

c. Determine the total time needed to run the full 100 meters. I got 6.32s which is unrealistic.

Please help me out I'm a little rusty just starting physics two and would love for you guys to solve and compare answers. Thank you!