17.3.7. The two-stage rocket at start with the Earth's surface in the vertical direction develops a reaction force R = 90 kN. Weights rocket stages are m1 = 200 kg, m2 = 100 kg. Determine the pressure force in kN between rocket stages at the time of launch.

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(DYNAMICS, Chapter 17 - The principle of D'Alembert, paragraph - 17.3: kientostatiki method for solid state and mechanical system) 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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