(Answered) Question a grindstone of radius 40 m is initially spinning

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

What is the magnitude of the angular acceleration of the grindstone?

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