Correct Answer: law of inertia

Solution : The correct answer is the law of inertia .

Newton's first law is also known as the law of inertia. The first law of Newton states if a body is at rest or moving at a constant speed in a straight line, then it will remain at rest or keep moving in a straight line at constant speed unless or until it is acted upon by a force. It means an object will not change its motion unless a force acts on it.