use the formula below for this question:
[tex]v_{f} = v_{i} + 2 * a * d[/tex]
re-arrange to solve for a:
[tex]a = \frac{v_{f} - v_{i}}{2 * d} [/tex]
now simply plug in your variables and there's your answer :). If you ever get stuck, you can look up the kinematic equations!
