2.)A loaded box weighing 800N is pulled along the level floor with constant velocity by means of a rope which is parallel to the floor. If the coefficient of friction is 0.14, what is the tension in the rope?  3.)If the rope in no. 2 forms an angle of 30° with the floor, what is the tension in the rope?  5.If the tension in no. 3 is still 120N, find the velocity and the distance traveled after 4 seconds. please answer number 5 only.

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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?”