Final answer:
Newton's first law of motion, or the law of inertia, states that objects maintain their state of motion unless acted upon by external forces due to inertia.
Explanation:
Newton's first law of motion, known as the law of inertia, explains how objects behave in the absence of external forces. Objects at rest remain at rest, and objects in motion continue at a constant velocity unless acted upon by an external force. Inertia is the tendency of an object to resist changes in its motion and is directly related to the object's mass.
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