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So let's assume that you have two velocities, v1, v2.
Perform a galilean transformation into the rest frame of v2. Object one collides with v1-v2.
Assuming both objects have the same mass:
object 1 has final velocity 0.
object two has final velocity v1-v2.
Reverse the transformation:
object 1 has velocity v2
object 2 has velocity v1
Thus, the objects are traveling at the same angle (with respect to the velocities) that they started with.
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