Acceleration Problem

1. The problem statement, all variables and given/known data
A runner wishes to complete a 1600m races in 5.0 min. She accelerates to racing velocity in the first 15s of the race then travels at a constant velocity for the next 4.0min. At this point she still has 250m to go. What must her acceleration be over the remaining distance in order for her to finish the race next time?

2. Relevant equations
The 5 BIG Kinematic Equations

3. The attempt at a solution
Δdτ = 1600m
ΔT = 300 seconds

http://ift.tt/1eiMcZz

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