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A 40.0 g superball traveling at 24.0 m/s bounces off a brick wall and rebounds at 18.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.5x10-3 sec, what is the magnitude of the average acceleration of the ball in this time interval?a =  Δv  /  Δta = (+24 – -18) / 4.5x10-3a = 9330 m/s2 
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