15.3.12. Hockey player, at a distance of 10 meters from the gate, according to stick puck lying on the ice, the speed of 8 m / s. The puck sliding on the ice surface, enters the gate with a speed of 7.7 m / s. Determine the coefficient of sliding friction between the puck and the ice surface.

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(Chapter 3 - Dynamics theme - 15.3: The theorem of change of kinetic energy of the material point and rigid body in translation) 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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