What is the BEST example of Newton's 1st law of motion?

Group of answer choices

A rocket will push off the ground with the same force as the ground pushes on the rocket.

A space probe flying through our solar system will travel at a constant velocity unless an unbalanced force acts on it.

It takes twice as much force to push a cart full of groceries than it does to push a cart half filled with groceries.

All objects that have balanced forces acting on them MUST be stationary.

All objects that have balanced forces acting on them must be stationary is an example of Newton's first law of motion.

Explanation:

Newton's First law of motion is the Law of inertia, that states a body continues to be in state opf rest or state of motion untill an unbalanced force acts on it. So if a body has all balanced forces acting on it then it will continue to remain in state of rest i. e. it will be stationary. The first example describes Newton's third law, that every action has equal and opposite reaction. The second and third example supports Newton's Second Law, the law of momentum which states that the rate of change oif momentum is directly proportional to the force applied on the body and the mass of the body.