In the arrangement of rigid links of equal length \( l \), they can freely rotate about the join...

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In the arrangement of rigid links of equal length \( l \), they can freely rotate about the joined ends as shown in the figure1.138. If the end \( U \) is pulled horizontally with constant speed 20 \( \mathrm{m} / \mathrm{s} \), find the approx. speed of end \( P \) when the angle SUT is \( 90^{\circ} \).
Figure \( 1.138 \)
(A) \( 5 \mathrm{~m} / \mathrm{s} \)
(B) \( 10 \mathrm{~m} / \mathrm{s} \)
(C) \( 7.1 \mathrm{~m} / \mathrm{s} \)
(D) \( 14.12 \mathrm{~m} / \mathrm{s} \)
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