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acceleration = change in speed /time = (10-25)/240=15/240 = -1/16

The train is slowing down (decelerating) at a rate of 1/16 mile per second per second

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Hate wasting work! Same answer in decimal.

Acceleration ( looks like slow down here ) = change in velocity/change in time

10 mi/s = 25 mi/s/240 s - 0

= - 0. 0625 mi/s2

======================long time braking

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Q: What describes a trains acceleration if you changes speed from 25 miles per second to 10 miles per second in 240 seconds?
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