The bar has a uniform cross-section and mass of 20 kg.

The slender bar AB rests on a smooth surface at B and is attached to a collar at A that slidesfreely on the smooth vertical rod. The bar has a uniform cross-section and mass of 20 kg. Thecollar has negligible mass. The bar is initially at rest with = 0 when it is released and rotatesin a vertical plane under the action of gravity [Note: the bar will be in an unstable equilibriumwhen released in this conguration. Assume that there is some very small perturbance that movespoint B slightly to the right].Using force-acceleration methods, determine the angular acceleration of the bar and reactions