Question
If action and reaction are equal and opposite, then how can the motion take place?
Solution
Action and reaction are equal and opposite. Action and reaction act on two different bodies.
If action and reaction act on the same body they will cancel each other and cannot cause the motion.
If action and reaction are on different bodies then they will not cancel each other and hence cause the motion.
If action and reaction act on the same body they will cancel each other and cannot cause the motion.
If action and reaction are on different bodies then they will not cancel each other and hence cause the motion.