Final answer:
Newton's first law states that objects maintain their state of motion or rest unless acted upon by a force.
Explanation:
Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an external force. Inertia is the tendency of an object to maintain its state of motion or rest. Mass is the property of matter related to inertia.
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