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A grindstone of radius 4.0m is initially spinning with an angular speed of 8.0rad/s. The angular...

A grindstone of radius 4.0m is initially spinning with an angular speed of 8.0rad/s. The angular speed is then increased to 12rad/s over the next 4.0 seconds. Assume that the angular acceleration is constant. What is the average angular speed of the grindstone?

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