A man has a mass of 80 kg on Earth. a. What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2 ? Show your answer in both Newtons and pounds. b. What is the man’s mass while on Mars? Explain your answer

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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?”