For the instant represented, corner C of the rectangular plate has an acceleration of 5 m/s² in the negative y-direction, and the plate has a clockwise angular velocity of 4 rad/s which is decreasing by 12 rad /s each second. Determine the magnitude of the acceleration of A at this instant. Solve by scalar-geometric and by vector-algebraic methods.

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B A a = 12 rad/s? y 300 mm --x w = 4 rad/s C 400 mm ac = 5 m/s?