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At a certain time a particle had a speed of 12 m/s in the positive x...

At a certain time a particle had a speed of 12 m/s in the positive x direction, and 3.2 s later its speed was 79 m/s in the opposite direction. What was the average acceleration of the particle during this 3.2 s interval?

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Chosnge in velov ave 232

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