Any collision has to follow the laws of physics, so any result from a collision of two bodies must comply with those laws. A head on collision will complete disintegrate both objects and the resulting debris would coalesce into smaller objects, or one large object and a few smaller ones (depending on the velocity and energy of the collision). A glancing collision would see one of the objects being totally destroyed and much of its mass absorbed by the other. What was left would form a smaller object or objects that may or may not go into orbit about the remaining large object. There are thousands of collisional outcomes which may or may not occur, but some collisions are dynamically impossible due to the constraints of the physical laws of nature.
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