1. The problem statement, all variables and given/known data An interaction occurs when two strong magnets are held stationary with the north pole of one pushed against the north pole of the other. On letting go, the magnets spring apart. It is apparent that the kinetic energy of the magnets has increased. Explain how the law of conservation of momentum applies in this case. 2. Relevant equations 3. The attempt at a solution What I think is that the total momentum in the system remains the same and a magnetic repulsion occurs on both bodies, as well as contact force, which is an action-reaction pair. Is it wrong? Thank you.