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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...

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dasmith22 | eNotes Newbie

Posted March 22, 2013 at 8:03 PM via web

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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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tjbrewer | Elementary School Teacher | (Level 2) Associate Educator

Posted March 22, 2013 at 10:39 PM (Answer #1)

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A train traveling 50 m/s reduces its velocity by 45 m/s over the course of 80 s.  Assuming that the velocity change is constant we would find the rate of change by dividing the amount of change (45 m/s) by the time it took (80 s)  `-45 m/s-:80s = -9/16` m/s^2.   Since a rate of change in velocity is acceleration your rate of acceleration would be -9/16 m/s^2 or -0.5625 m/s^2. 

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