Planet 1 has mass 3M and radius R, while Planet 2 has mass 4M and radius 2R. They are separated by center-to-center distance 8R. A rock is placed halfway between their centers at point O. It is released from rest. Ignore any motion of the planets. What is the magnitude of acceleration of the rock the moment it is released, and when the rock is released from point O derive an expression for the speed v with

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