Задача 10682.

On the board weighing 20 kg is a bar weighing 5 kg. What kind of horizontal force should I put on the board to pull it out from under the bar? The coefficient of friction between the bar and the board is 0.6, between the board and the support -0.2.

A detailed solution with a brief statement of the condition, formulas and laws used in the solution, the derivation of the formula and the answer.
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