20.5.12. The kinetic energy of the system T = 6s2, body mass m1 = m2 = 6kg. Determine the acceleration of the body 1, if the coefficient of friction between the horizontal surface and the body 1 is f = 0,2.

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(DYNAMICS, Chapter 20 - Lagrange equation of the second kind, paragraph - 20.5: Lagrange equation of the second kind for 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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