Opposite magnets attached to carts on a track roll towards each other. they repel, but...?

Question

Does the velocity of the two carts as they reverse direction increase, decrease, or stay the same?

Notes: the carts do not hit each other, but the magnets make them reverse direction. This is a frictionless, airless environment, no forces acting other than the force of the carts being initially pushed.

Answer 1

When we intially pushed we applied force on both
the carts to make them move towards each other with some velocity. Just after we removed our pushing hand each cart was pushing the other with equal and oposite force this force first reduces the approaching speed of both of them to zero and then increase the speed in opposite directions at the same rate if their masses are exactly equal.. It is just like when a stone is thrown up its speed decreases first, becomes zero and then increases in opposite direction. Here similar thing happens with each of both carts.