posted by Anonymous .
An athlete wants to complete the 4000 m run in 12.0 minutes. After exactly 10.0 minutes of running at a constant speed, she still has 800 m to go. If she then accelerates to 4.0 m/s^2, how much longer will it take her to complete the race?
She is traveling at 3200m/12(60)sec
figure out that.
d is 800, vi is above, solve for t.