A 25.0-kg girl in a swing is pushed to one side and held at rest by a horizontal force F so that the swing ropes are 20.0° with respect to the vertical.  a) Draw a free body diagram for the scenario described.  b) Calculate the tension in each of the two ropes supporting the swing under these conditions.  c) Calculate the magnitude of F

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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?”