申論題

(2) (Please see Fig. 2) Three identical small spheres, each of mass 1 kg, can slide freely on a horizontal frictionless surface. Spheres B and C are connected by a light rod and are at rest in the position shown when sphere B is struck squarely by sphere A which is moving to the right with a velocityV_o= 2.4 m/s. Knowing that θ = 45°and that the velocities of spheres A and B immediately after the impact are and ， determine (a) (9%); and (b) the velocity of sphere C immediately after impact. (16%)