Wow that's embarrassing.
I did it two ways and got 80 m and 500 m, the second way was:
(v final)^2 = (v initial)^2 + 2ad
d = [(v final)^2 - (v initial)^2]/2a
d = (20)^2/2(0.4)
d = 500 m
I figured I was wrong, and picked the smallest answer... in my defense I was on the phone and was working on economics, lmao
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