$26.$ Crank CB oscillates about C through a limited arc causing crank $\backslash ($ O A $\backslash )$ to oscillate about O $.$ When the linkage passes the position shown with CB horizontal and $\backslash ($ O A $\backslash )$ vertical, the angular velocity of CB is $\backslash (2\backslash$mathrm$\{$rad$\}/\backslash$mathrm$\{$s$\}\backslash )$ counterclockwise. Determine the angular velocities of $\backslash ($ O A $\backslash )$ and $\backslash ($ A B $\backslash )$ for this instant. Where are the instantaneous centers of rotations for $\backslash (\backslash$mathrm$\{$OA$\},\backslash$mathrm$\{$AB$\}\backslash ),$ and BC $?$