15.7.9. 2 to determine the speed at load time, when it goes down by a distance s = 4 m, Goods if m1 = weight of 2 kg, m2 = 4 kg. Phone system is initially at rest.

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(Chapter 3 - Dynamics theme - 15.7: The theorem of change of kinetic energy of the mechanical system) from 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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