15.3.9. By ABC wire situated in a vertical plane and curved in the form of arcs of circles of radii r1 = 1 m, r2 = 2 m, can slide without friction ring D mass m. Determine the speed of the ring at the point when its speed at the point A is equal to zero.

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(Chapter 3 - Dynamics theme - 15.3: The theorem of change of kinetic energy of the material point and rigid body in translation) from Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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