20.2.15. The load weight m = 6 kg is suspended on a spring in which the deformation occurs restoring force F = -300y Determine to see the y coordinate at which the generalized force Qy is equal to zero. Point A is the end of the spring in the undeformed condition.

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(DYNAMICS, Chapter 20 - Lagrange equation of the second kind, paragraph - 20.2: Generalized power systems with one degree of freedom) of 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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