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Apr 27, 2017 at 19:53 comment added Michael Seifert @LM26: You're assuming that the bodies are perfectly rigid. The problem is that bodies generally deform in a collision, and so different parts of the "composite body" you're envisioning will be moving at different speeds (and so move different distances in the same interval of time.)
Apr 27, 2017 at 19:23 comment added LM26 How can they not move the same distance during a collision , this is not matching up with my intuition , during the period over which they exert forces on each other , then both can be considered as one body , since the only time they exert forces on each other is if they are in physical contact ( interacting with one another ), then how can one body move two distances . Your math makes sense , it is just that I can't picture the situation .
Apr 27, 2017 at 14:51 history answered Michael Seifert CC BY-SA 3.0