The uniform 40-lb bar with attached 12-lb wheels is released from rest in the orientation shown. The wheels have a centroidal radius of gyration of 4.5 in., and the coefficients of static and kinetic friction between the wheels and the horizontal and vertical surfaces are μ_s = 0.65 and μ_k = 0.50. Friction may be neglected in the pins connecting the wheels to the bar. Determine the acceleration components of the mass center of the bar at the instant of release.

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B 6" 4' y L-x A 60°