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With what minimum acceleration the bar \( A \) should be shifted horizontal to keep bodies 1 and 2 stationary relative to
\( \mathrm{P} \) the bar? The masses of the bodies are equal, and the coefficient

W of friction between the bar and the bodies is equal to \( k \). The masses of the pulley and the threads are negligible, the friction in the pulley is absent. See figure-2.214.
Figure 2.214
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