Which of the following statements is/are correct? i. If a non zero net force acts in an object, it will accelerate ii. For every action force, there must be an equal and opposite reaction force. iii. Acceleration is directly proportional to the force and inversely proportional to the mass. iv. In the absence of a resultant force, an object at rest will remain at rest v. Forces occur in pairs

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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?”