Which of the following scenarios best demonstrates Newton’s 3rd law of motion? (Kindly explain why other options are not.) A. A large truck accelerates slowly compared to a small car when pushed by the same amount of force. B. Three balanced forces acting on a single object causes it to move at constant speed along a straight line. C. A person experiences a greater acceleration due to gravity on Earth’s surface than on the Moon’s surface. D. An astronaut moves backwards as he pushes forward on the walls of a space station.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”