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What is a force? A. A force is a push or a pull. B. A force is a substance that reacts with matter. C. A force is equivalent to work. D. A force is a form of energy

User Spodger
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A. is the answer because based on Newton's First Law, "an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force." Therefore, a force is a push or pull because things won't stop unless pushed or pulled on.
User Allison Lock
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