A block \( A \), of weight \( W \), slides down an inclined plane \( S \) of slope \( 37^{\circ}...

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A block \( A \), of weight \( W \), slides down an inclined plane \( S \) of slope \( 37^{\circ} \) at a constant velocity, while the plank \( B \), also of weight \( W \), rests on top of \( A \). The plank \( B \) is attached by a cord to the top of the plane. The coefficient of kinetic friction \( \mu \) is the same
\( \alpha=37^{\circ} \)
between the surfaces \( A \) and \( B \) and between \( S \) and \( A \). Determine the value of \( 1 / \mu \).
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