A car slows down from 20m/s to rest in a distance of 85m. What was its acceleration if it is assumed constant?

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A car slows down from 20m/s to rest in a distance of 85m. What was its acceleration if it is assumed constant?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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this is what I have so far: initial velocity: 20m/s, final velocity: 0m/s, distance = 83m. Since I want to find acceleration I've used this equation: vf^2=vi^2+2ad where (0m/s^2)=(20m/s)^2+2a(85m). My answer was 570m/s^2 but I know this is wrong.. Where did I go wrong?

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