At a certain time a particle had a speed of 80 m/s in the positive x direction, and 7.0 s later its speed was 90 m/s in the opposite direction. What was the average acceleration of the particle during this 7.0 s interval?
I can think of two answers that I could get:
24.29m/s^2
1.43 m/s^2
Any help would be appreciated.

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Ok, thanks! I just wanted another set of eyes to look at it.

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