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A train travels at a velocity of +50 m/s. It takes 80 s to slow down to 5 m/s with constant acceleration. What was its acceleration?

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Below are the choices that should accompanied your question above. I think the answer is B. 

A. -0.064 m/s2 B. -0.56 m/s2 C. -8.0 m/s2 D. -10.0 m/s2

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