A link \(A B\) of a four-bar mechanism \(A B C D\) revolves uniformly at \(120 \mathrm{rpm}\) in a clockwise direction. Find the angular acceleration of links \(B C\) and \(C D\) and acceleration of pont \(E\) in link \(B C\). Given: \(A B=75 \mathrm{~mm}, B C=175 \mathrm{~mm}, E C=50 \mathrm{~mm}, C D=150 \mathrm{~mm}, A D=100 \mathrm{~mm}\), and \(\angle B A D=90^{\circ}\).