Newton's Laws - Mission NL12 Detailed Help

A sprinter in track is able to progress towards the finish line due to the marvels of Newton's third law. Identify the two letters corresponding to the action-reaction FORCE pairs which are responsible for this running action.

Newton's Third Law:
For every action there is an equal and opposite reaction.

Action-reaction force pairs explain much of the locomotion in this world. In the case of a track sprinter, there is the interaction between the sprinter and the ground (track). Like any interaction, it is a mutual interaction between two objects that results in equal forces on both objects directed in opposite directions.
To answer this question correctly, look for the pair of action-reaction interactions between the sprinter and the ground. The action and reaction statements should involve these same two objects. And the interactions should be directed in opposite directions.

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