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A ball rolls up a slope. At the end of 1.8 seconds, its velocity is 27.6 cm/s. At the end of 11.2 seconds, its

A ball rolls up a slope. At the end of 1.8 seconds, its velocity is 27.6 cm/s. At the end of 11.2 seconds, its velocity is 3.9 cm/s. What is the average acceleration (in cm/s) during this time interval? Round your answer to the nearest tenth. Do not use scientific notation.

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