According to Newton's third law of motion, action force and reaction force are equal and opposite. This means:
1. When one object exerts a force on a second object (action force), the second object simultaneously exerts a force of the same magnitude but in the opposite direction on the first object (reaction force).
2. For example, if you push against a wall with a force of 50 Newtons to the right (action force), the wall pushes back on you with a force of 50 Newtons to the left (reaction force).
Therefore, in the context of Newton's third law of motion, it is the action force and reaction force that are equal and opposite, not momentum and velocity, collision time and stop time, or mass and momentum.
