2-The train consists of a 30-Mg engine E, and cars A, B, and C, which have a mass of 15 Mg, 10 Mg, and 8 Mg, respectively. If the tracks provide a traction force of F=30kN on the engine wheels, determine the speed of the train when t-30s, starting from rest. Also, find the horizontal coupling force at D between the engine E and car A. Neglect rolling resistance.(V= „FD= F = 30 kN

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Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.