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The crank OA has an angular acceleration 0 8 rad/s² and an angular velocity = 4 rad/s, at the instant when -60°

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The crank OA has an angular acceleration 0 8 rad/s² and an angular velocity = 4 rad/s, at the instant when -60°.The roller rolls without slipping on the flat surface of the plunger, and the spring maintains contact between the roller and the plunger.For the instant considered, determine the velocity and acceleration of the shaft B: