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Speed of Point on Rim of Wheel

Trying to visualize this scenario so I can draw a picture, but I am drawing a blank. I think that I have to use the mgh equation and mv^2/r equation. Also, do you think you could offer some additional questions that might be relevant to this problem so I can practice.

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A piece of putty is stuck to the rim of a grinding wheel that rotates about a horizontal axis. The putty breaks loose from the wheel at a point at the same horizontal height as the axis of rotation. The putty rises vertically and returns to the height of the axis or rotation at the instant that the wheel ...