13.5.14. The differential equation of motion of a particle is given by 5x + 20x + cx = 0. Find the largest value of the coefficient of stiffness with, at which point the movement is aperiodic.

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(Chapter 3 - Dynamics theme - 13.1: Free damped oscillations) 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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