In the arrangement of rigid links of equal length $l$ , they can freely rotate about the joined ends as shown in the figure-1.138. If the end $U$ is pulled horizontally with constant speed 20 m/s, find the approximate speed of end $P$ when the angle $S U T$ is $9 0^{\circ}$ :

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By the rigid-link constraint, velocity components along each link are equal at its ends; propagating from U through the link joints with the 9 0 ∘ geometry gives v P ​ = 5 2 ​ ≈ 7.1 m/s. Option C.

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