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Newton's THIRD law pair: when you push a wall, the wall pushes you. These forces:
ACancel each other since they're equal and opposite
BAct on DIFFERENT bodies (one on wall, one on you) — so they don't cancel; they're a true action-reaction pair
CAct on the same body
DAre not really equal
Answer & Solution
Correct answer: B. Act on DIFFERENT bodies (one on wall, one on you) — so they don't cancel; they're a true action-reaction pair
Action-reaction pairs ALWAYS act on different bodies. The force on the wall (push) and the force on you (reaction) are separate forces on separate objects. They don't cancel because they're not on the same body.
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