In the instant shown in the figure, the board is moving up vertically with constant velocity \( ...

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In the instant shown in the figure, the board is moving up vertically with constant velocity \( (v) \). The drum winds up
\( \mathrm{P} \) at a constant rate \( \omega=15 \mathrm{rad} / \mathrm{s} \). If the radius of the drum is
\( \mathrm{W} \) \( R=10 \mathrm{~cm} \) and the board always remains horizontal. Find its velocity of board at this moment( in \( \mathrm{m} / \mathrm{s} \) ).
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