Knowing that block \( B \) starts to move downward with a constant velocity of \( 18 \mathrm{~cm...

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Knowing that block \( B \) starts to move downward with a constant velocity of \( 18 \mathrm{~cm} / \mathrm{sec} \), the velocity of block \( A \) will be :
(A) \( 27 \mathrm{~cm} / \mathrm{s} \)
(B) \( 12 \mathrm{~cm} / \mathrm{s} \)
(C) \( 36 \mathrm{~cm} / \mathrm{s} \)
(D) \( 9 \mathrm{~cm} / \mathrm{s} \)
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