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Question:

Which of Newton's laws states that:
An object at rest will stay at rest unless an external force acts upon it.
An object in motion won't change its velocity unless an external force acts upon it.

A Newton's First Law of Motion
explanation

Newton's First Law is often called the law of inertia.
Newton's Second Law: Force = Mass × Acceleration.
Newton's Third Law: For every action, there is an equal and opposite reaction.