The time it takes a spinner to stop completely is 12 seconds. If the spinner completes 6 revolutions in this time, what was the average angular velocity of the spinner, in radians per second, for the 12 -second interval?

Six revolutions cover 6 × 2π = 12π radians. Average angular velocity is total angular displacement divided by elapsed time, so 12π ÷ 12 = π radians per second. Therefore, the correct choice is π.

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