Three identical small spheres, each of weight 2 lb, 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 velocity v0 = (8 ft/s)i. Knowing that θ= 45° and that the velocities of spheres A and B immediately after the impact are vA = 0 and vB = (6 ft/s)i + (vB)yj, determine (vB)y and the velocity of C immediately after impact.

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Projectile Motion