Answer :
Here, Newton's third law is applied when the two carts exert equal levels of force on one another.
If object A exerts a force on object B, then object B must apply a force on object A that is equal in magnitude and directed in the opposite direction, which was used here. Newton's third law illustrates a symmetry in nature whereby forces always occur in pairs and whereby nobody can exert a force without also being subjected to one.
When two things collide, what happens to the force?
When two objects collide, forces of equal magnitude and opposite direction are applied to each object. Such pressures frequently result in one thing gaining momentum and gaining speed while the other object slows down (lose momentum).
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