The following diagrams show different objects of equal mass acted on by one or more forces. In the following diagrams, each force vector labeled as F has the same magnitude. a) Which of the four objects shown has zero net force acting on it? b) Which object or objects have the greatest magnitude of force? (Select all that apply) c) What object or objects move with constant velocity? (Select all that apply) d) What object or objects move with variable speed? (Select all that apply)

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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?”