Two identical cars traveling at the same speed collide headon and come to rest in a mangled heap. At first glance it appears that energy is not conserved in this collision. However, like Dennis’s mother in Richard Feynman’s story at the beginning of the chapter, we find the energy “hidden” in many different forms. The initial kinetic energy is transformed into sound energy, thermal energy, and deformation energy. Where does the initial momentum of the system hide?
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