20.4.6. The material point M is the mass m = 1 kg is lifted vertically. Determine the rise velocity v at the time point when the kinetic potential is zero, and it is located at a height h = 6 m, if h = 0, the potential energy P0 = 0.

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(DYNAMICS, Chapter 20 - Lagrange equation of the second kind, paragraph - 20.4: The kinetic potential) 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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