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Baoshan district 3 rd Moore mathematics
The actual motion of the contact point between the rod and the platform is that the joint motion direction is perpendicular to the rod and points to the upper left. As shown in the figure, the joint velocity V is a real number =ωL, and the vertical velocity component is equal to V, that is, ωLsinα=v,

So ω = vlsin α. So ACD is all wrong and B is correct.

So choose B.