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One end of a thin rod is attached to a pivot, about which it can rotate without friction. air resistance is absent. the rod has a length of 0.80 m and is uniform. it is hanging vertically straight downward. the end of the rod nearest the floor is given a linear speed v0, so that the rod begins to rotate upward about the pivot. what must be the value of v0, such that the rod comes to a momentary halt in a straight-up orientation, exactly opposite to its initial orientation?
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