A 75g 31 cm long rod hangs vertically on a frictionless, Ask an Expert

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A 75g , 31 cm long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 12g ball of clay traveling horizontally at 2.1 m/s hits and sticks to the very bottom tip of the rod.

To what maximum angle, measured from vertical, does the rod (with the attached ball of clay) rotate?

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