Newton's first law of motion is also called the law of inertia. Why?

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(N/A) According to the first law of motion,a body at rest remains at rest,and a body in motion continues to move in a straight line at a constant speed unless acted upon by an external unbalanced force.
This inherent property of a body to resist any change in its state of rest or uniform motion is known as inertia.
Since the first law of motion defines this property,it is commonly referred to as the law of inertia.

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