Final answer:
Newton's First Law of Motion, also known as the law of inertia, describes how objects remain at rest or in motion unless acted upon by an external force.
Explanation:
Newton's First Law of Motion, also known as the law of inertia, states that a body at rest remains at rest or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This law explains the concept of inertia, which is the tendency of an object to maintain its state of motion.
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