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Because \( v_f = 0 \), you have
\[ a = -\frac{v_i^2}{2d} \]

i see.

and my final answer was 570m/s^2. Maybe I need to divide the 400 by 170....

Using the equation I wrote down,
\[ a = -\frac{v^2}{2d} = -\frac{400}{170} = 2.35 \]

*dropped the negative
\[ a = -2.35 \ m/s^2 \]

yes I ended up with the same answer. I figured out what I did wrong thanks.