Classical Newtonian mechanics tells us that if a body is at rest or traveling in a straight line at a constant speed, it will remain at rest or continue moving in a straight path at the same speed until acted upon by a force. What's this law called?

Answer The Law of Inertia

Newton's first law asserts that without the intervention of an external force, any object will stay at rest or in uniform motion along a straight line until driven to alter its condition. This is also called the law of inertia.

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