The three forces represented in the figure shown act on a model of a Space-X rocket while it sits on a launch pad. What fourth force must act on the rocket so that it does not accelerate and stays at rest while waiting for launch? a) 7.0 N i + 2.0 N j b) 1.0 N i - 5.0 N j c) 3.0 N i + 4.0 N j d) 3.0 N i - 4.0 N j e) - 1.0 N i + 5.0 N j

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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?”