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F = MaIf F > 0 then a > 0F = B_{1}B_{2}/r^{2} > 0 for all r

If the magnets were in space, but fixed in alignment via a hypothetical taut string of infinite length and zero friction, then they would continue accelerating forever. With an acceleration force which declines with the square of distance, if they start off with a non-zero initial separation (determined by the physical size of the magnets), then I expect they will asymptotically approach a finite separation velocity.However, in practice, if the magnets were in space with no alignment mechanism and released, they would flip around so they are facing North to South poles, and clamp together, reaching zero acceleration and zero velocity immediately.