13.4.2. Load mass m = 20 kg is suspended from a spring with stiffness coefficient c = 400 N / m and is in the straight vertical oscillatory motion. Determine at what distance from the static equilibrium position is the center of gravity at a time point when acceleration is 3 m / s.

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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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