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both forces are working only in one direction.
Dear Sir,just do a simple experiment .Take a Rubber band and try to stretched it with your hands and it will be stretched .Now take the help of an another person to catch this stretched rubber band in middle with the help of fingers .now release the right part of the rubber band but remember the left part of the rubber band must not be released( still in stretched position) only released the right part .when you will release the right part of the rubber band then the person will feel a propelling force working on pushing his fingers in left direction of stretched rubber band.this is very simple and it will take only a few seconds to understand this concept completely.