Answer the following question given this paragraph: 

4.2 Newton’s First Law of Motion: Inertia • Newton’s first law of motion 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 is also known as the law of inertia. • Inertia is the tendency of an object to remain at rest or remain in motion. Inertia is related to an object’s mass. • Mass is the quantity of matter in a substance.


Q: What is the tendency of an object to remain at rest or remain in motion called?

 Choices:

- impetus

- magnetism

- flow

- inertia

A:
inertia
