13.4.11. The body is suspended in the spring and makes the free vertical oscillations with a period T = 0.5 s. To determine the mass of the point, if the spring constant of the spring c = 200 N / m

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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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