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**Two spheres are released from rest when the distance between their centers is 12R. Sphere 1 has mass M and radii R while sphere 2 has mass 2M and radii 3R. How fast will each sphere be moving when they collide? Assume that the two spheres interact only with each other. (Use G for gravitational constant, and M and R as necessary.)**

I need to find the symbolic answer for V1f and V2f, I have no clue, please help...due in an hour. Thanks