Задача 10872.

The shock of the hammer ramming systems for pile driving, the mass of which 0.4 tons, falling at a speed of 3 m / s and pile hammers weighing 0.8 tons in soil pit dug under the foundation of the building. Calculate the value of the kinetic energy of the hammer impact (including a blow completely inelastic); energy spent to dive piles into the soil excavation; Efficiency during impact.

Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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