14.3.11. The train moves along a horizontal straight section of track. When braking force is developing resistance, which is equal to 0.2 weight train. After some time, the train will stop if its initial velocity of 20 m / s.

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(Chapter 3 - Dynamics theme - 14.3: The theorem of change of momentum) 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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