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**Equations of Motion Help!!!**

I have been working on this for awile and still cant figure it out. What equation would I use to solve this problem? Here is the problem:

On a ride called the Detonator at Worlds of Fun in Kansas City, passengers accelerate straight downward from zero to 45 mi/h in 1.0 seconds. What is the average acceleration of the passengers on this ride?

Any and all help would be greatly appreciated!