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