Final answer:
Inertia is the tendency of an object to remain at rest or in motion unless acted upon by an external force.
Explanation:
Inertia is the property of a body to remain at rest or in motion with constant velocity unless acted upon by an external force. It is measured by the object's mass. Newton's first law, also known as the law of inertia, explains that an object will maintain its state of motion unless a net force acts on it.
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