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I was driving along at 20 m/s , trying to change a CD and not watching where I was going. When I looked up, I found myself 45 m from a railroad...

I was driving along at 20 m/s , trying to change a CD and not watching where I was going. When I looked up, I found myself 45 m  from a railroad crossing. And wouldn't you know it, a train moving at 30m/s  was only 60m from the crossing. In a split second, I realized that the train was going to beat me to the crossing and that I didn't have enough distance
to stop. My only hope was to accelerate enough to cross the tracks before the train arrived. If my reaction time before starting to
accelerate was 0.5s , what minimum acceleration did my car need for me to be here today writing these words?

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