For the instant represented when \(y=160 \mathrm{~mm}\), the piston rod of the hydraulic cylinder \(C\) imparts a vertical motion to the pin \(B\) consisting of \(\dot{y}=400 \mathrm{~mm} / \mathrm{s}\) and \(\ddot{y}=-100 \mathrm{~mm} / \mathrm{s}^{2}\). For this instant determine the angular velocity \(\omega\) and the angular acceleration \(\alpha\) of link \(O A\). Members \(O A\) and \(A B\) make equal angles with the horizontal at this instant.

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y B C 200 mm 300 mm A