A bar of mass \( m \) resting on a smooth horizontal plane starts moving due to a force \( F=m g...

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A bar of mass \( m \) resting on a smooth horizontal plane starts moving due to a force \( F=m g / 3 \) of constant magnitude. In the process of its rectilinear motion, the angle \( \theta \) between the direction of this force and the horizontal varies as \( \theta=k s \), where \( k \) is a constant. Find the velocity of the bar as a function of the angle \( \theta \)
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