Final answer:
Inertia is the tendency of an object to remain at rest or in motion unless acted upon by a force. It is measured by the object's mass.
Explanation:
Inertia is the property of an object to remain at rest or in motion unless acted upon by an external force. It is related to an object's mass, which quantifies its inertia. For example, a large boulder has more inertia and is harder to set in motion compared to a basketball.
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