15.3.6 The material point M is the mass m, suspended by a thread OM length = 0.4 m to a fixed point O, assigned by an angle alpha = 90 ° from the position of equilibrium and released without initial velocity. Determine the velocity of this point as it passes through the equilibrium position.

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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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