$5/156$ A mechanism for pushing small boxes from an assembly line onto a conveyor belt is shown with arm OD and crank CB in their vertical positions. For the configuration shown, crank CB has a constant clockwise angular velocity of rad$/$s$.$ Determine the acceleration of E$.5/156$ A mechanism for pushing small boxes from an assembly line onto a conveyor belt is shown with arm $\backslash ($ O D $\backslash )$ and crank $\backslash ($ C B $\backslash )$ in their vertical positions. For the configuration shown, crank $\backslash ($ C B $\backslash )$ has a constant clockwise angular velocity of $\backslash (\backslash$pi $\backslash$mathrm$\{$rad$\}/\backslash$mathrm$\{$s$\}\backslash ).$ Determine the acceleration of $\backslash ($ E $\backslash ).$