Include given, required at the start of the problem given. A 12-kg box is released from the top of an incline that is 5.0 m long and makes an angle of 40 0 to the horizontal. A 60-N friction force impedes the motion of the box. What will be the acceleration of the box and how long will it take to reach the bottom of the incline?

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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?”