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If an impact is an event spanning an infinitesimally small time interval, is the total potential energy of two colliding objects conserved through the impact? What about the potential energy of each individual object?

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Answer to the first question. In an impact the potential energy of the system is conserved. The reason is that in an infinitesimal time interval our impact model allows objects to change velocity but not position. No change in position implies that there cannot be a change in potential energy through an  impact for any of the colliding objects and therefore for the system as a whole.
Answer to the second question. In an impact the potential energy of each colliding object is conserved. The reason is that in an infinitesimal time interval our impact model allows objects to change velocity but not position. No change in position implies that there cannot be a change in potential energy through an impact for any of the colliding objects.

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