A figure skater begins spinning counterclockwise at an angular speed of 3.1 rad/s. During a 4.2 s

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Question:

A figure skater begins spinning counterclockwise at an angular speed of 3.1 rad/s. During a 4.2 s interval, she slowly pulls her arms inward and finally spins at 7.2 rad/s. What is her average angular acceleration during this time interval? Answer in units of rad/s 2 .