Consider a pair of lovers at rest. Each lover is then acted by a single force, which causes them to move  in their own separate ways. Which of the following is/are TRUE? Explain why. I. If the force is external to the lovers, then their total momentum won’t change.  II. If the force is internal to the lovers, then their center of mass won’t change.  III. If the force is internal to the lovers, then their individual positions won’t change.

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