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I was really confident that I had done this problem right. I have no idea where I went wrong. :(

A car accerlation from rest to a speed of 40 mi/hr in 12s. How far does the car travel during this time?

I remembered my teacher saying that speed is equal to the distance over time. So I thought that I could solve for this distance using that equation. I converted the 40 mi/hr into 0.01787 m/s and then multiplied by 15s to get a really small number. I think I messed up somewhere. Could I please have a hint? Thanks!

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# I was so sure I had gotten this acceration problem right

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