9. Planet A has mass 3M and radius R, while planet B has mas 4M and radius 2R. They are separated by a distance of 8R. A rock is released from rest halfway between the planet's centers at point 0. What is the magnitude of the acceleration of the rock immediately after it is released? [Answer: a = 1/16 GM/R²]. 8R 2R R. 4M 3M Planet A Planet B

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