P-initial=P-final
This is directly related to Newton 3rd Law, which justifies that all gorces come in pairs. But this is not the only physics involved in car crashes. When poth cars are moving towards eachother, they are exterting kinetic energy, and when they both come in contact with eachother, hit and begin to slide their energy is turned into potential. Also, when two cars hit their average velocity will drastically decrease! Who knew car crashes could have so much physics involved!?
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