22.1.5. The collision of the material point M with the barrier angle of incidence α = 30 °, and the reflection angle β = 36 °. Velocity after impact v2 = 5,1 m / s. Assuming that the barrier is absolutely smooth, determine the value of the velocity v1 before the impact.
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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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