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Unfortunately I'm stuck on another problem. For this one I first converted 3.5 ms to 0.0035s. I chose an arbitrary time, such as 4 seconds to give some perspective on time. I multiplied 25.1m/s x 4s to get a distance thinking that it took the ball 4s to hit the wall at that velocity. 25.1 x 4 = 100.4m. Then I determined the time it would take the ball to bounce back the same distance but at 22.8m/s using cross mulitplying and solving for t (time). 22.8m/ 1s = 100.4m/t. Then I used this info. to calculate average acceleration= (v2-v1)/ (t2-t1). I assume that when it asks for the magnitude it means absolute value, correct me if I'm wrong. The answer I got was 0.273 m/s^2 and it's wrong. I used this approach for another problem and it worked so let me know if this is at all the correct approach or if I'm completely off.

Thanks