22.1.12. With a speed of 12 m / s material point hitting a stationary obstacle. Determine the time of impact, where the average impact force equal to five times the weight of the material point. Beat considered direct and absolutely inelastic.
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(DYNAMICS, Chapter 22 - Small oscillations of mechanical systems, par - 22.1: The action of the impact force on a material point) 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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