Two bars of masses \( m_{1} \) and \( m_{2} \) connected by a non-deformed light spring rest on ...

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Two bars of masses \( m_{1} \) and \( m_{2} \) connected by a non-deformed light spring rest on a horizontal plane. The coefficient of friction between the bars and the surface is equal to \( k \). What minimum constant force has to be applied in the horizontal direction to the bar of mass \( m_{1} \) in order to shift the other bar?
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