Question

when a person pushes against the ground with their foot, the equal and opposite reaction force is
the ground pushing back on their foot
when they start to move forward

Explanation:

This relates to Newton's Third Law of Motion, which states that for every action force, there is an equal and opposite reaction force. The action is the person pushing against the ground with their foot; the reaction is the force that propels the person forward.

Answer:

The equal and opposite reaction force is the ground pushing back on their foot, which causes the person to start to move forward.
Matching pair:

• Action: Person pushes against the ground with their foot
• Reaction: the ground pushing back on their foot
• Result: when they start to move forward