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Average acceleration = change in speed/time = 2.4/0.8 = 3 ms-2

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Q: What is the average acceleration of a subway train that speed up from 9.6 m s to 12 m s in 0.8 s on a straight section of track?
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What is the average acceleration of a subway train that speeds up from 9.6ms to 12ms in 0.86s on a straight section of track?

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