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.

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.

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