The uniform plate weighs 40 lb and is supported by a roller at A. If a horizontal force F...

The uniform plate weighs 40 lb and is supported by a roller at A. If a horizontal force F = 70 lb is suddenly applied to the roller, determine the acceleration of the center of the roller at the instant the force is applied. The plate has a moment of inertia about its center of mass of IG = 0.414 slug • ft2. Neglect the weight of the roller.