13.4.23. Determine the module of the initial velocity of the material point at which its free vibrations will comply with the law of motion, given the graph of the function y = y (t).

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(Chapter 3 - Dynamics theme - 13.1: Free undamped vibrations) from 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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