a bank robber in a getaway car approaches an intersection at a speed of 45 mph. just as he passes the intersection, he realizes that he needed to turn. so he steps on the brakes comes to a complete stop, and then accelerates driving straight backward. he reaches a speed of 22.5 mph moving backward. altogether his deceleration and re-acceleration in the opposite direction take 12.4 second. what is the average acceleration during this time

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