An object is at rest. At five seconds, someone comes over and pushes the object forward with a force of 10 N. After it is pushed, the object is still at rest. Which of the following choices describes how static equilibrium could have been achieved when the object was pushed? A) A force greater than 10 N was exerted straight down on the object, countering the normal force. B) A force greater than 10 N was exerted in a forward direction on the object at exactly five seconds so that the forces were balanced, and the object remained at rest. C) A force of exactly 10 N was exerted straight down on the object, countering the normal force. D) A backward force of 10 N was exerted on the box at exactly five seconds so that the forces were balanced, and the object remained at rest.

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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?”