The three identical spheres, each of mass m, are supported in the vertical plane on the...

The three identical spheres, each of mass m, are supported in the vertical plane on the 30° incline. The spheres are welded to the two connecting rods of negligible mass. The upper rod, also of negligible mass, is pivoted freely to the upper sphere and to the bracket at A. If the stop at B is suddenly removed, determine the velocity v with which the upper sphere hits the incline. (Note that the corresponding velocity of the middle sphere is v/2.) Explain the loss of energy which has occurred after all motion has ceased.