For every action there is an equal and opposite reaction is which law?

• A. Newton's First Law of Motion
• B. Newton's Second Law of Motion
• C. Newton's Third Law of Motion
• D. Law of Conservation of Momentum

Answer: (C)

When two objects interact, they exert equal-magnitude forces on each other in opposite directions. These action-reaction forces form a pair and act on two different objects, so they don’t cancel each other out even though they are equal. This is why pushing against a wall makes you feel a push back from the wall, and why a rocket moves forward as exhaust gases are forced backward.

This idea is Newton's Third Law of Motion. It isn’t describing how a single object accelerates in response to a net external force (that’s what the First and Second Laws cover). It’s about the paired forces that occur during interactions between two bodies.