Question: At a certain time a particle had a speed of 18 m/s in the positive x direction, and 2.4 s later its speed was 30

At a certain time a particle had a speed of 18 m/s in the positive x direction, and 2.4 s later its speed was 30 m/s in the opposite direction. What is the average acceleration of the particle during this 2.4 s interval?

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