Until a train is a safe distance from the station it must travel at 5 m/s. Once the train is on open track it can speed up to 45 m/s. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (Round your answer to the nearest whole number.)
A) 4 m/s2
B) 5 m/s2
C) 6 m/s2
D) 7 m/s2
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