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Two particles \( A \) and \( B \) are connected by a rigid rod \( A B \). The rod slides along perpendicular rails as shown
\( \mathrm{P} \) here. The velocity of \( A \) to the left is \( 10 \mathrm{~m} / \mathrm{s} \). What is

W. the velocity of \( B \) when angle \( \alpha=60^{\circ} \) ?
(1) \( 10 \mathrm{~m} / \mathrm{s} \)
(2) \( 9.8 \mathrm{~m} / \mathrm{s} \)
(3) \( 5.8 \mathrm{~m} / \mathrm{s} \)
(4) \( 17.3 \mathrm{~m} / \mathrm{s} \)
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