Question: Two objects interact with each other and with no other objects. Initially object A has a speed of 4 m s and object B has

Two objects interact with each other and with no other objects. Initially object A has a speed of 4ms and object B has a speed of 3ms. In the course of their motion they return to their initial positions. Then A has a speed of 7ms and B has a speed of 6ms. We can conclude
mechanical energy was increased by conservative forces.
mechanical energy was increased by nonconservative forces.
the potential energy is changed from the beginning to the end of the trip.
mechanical energy was decreased by conservative forces.
mechanical energy was decreased by nonconservative forces.
Two objects interact with each other and with no

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