A ?=1.55 object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a ?W=13.5 horizontal force. Find the magnitude of the tension in the rope and the rope's angle from the vertical. The acceleration due to gravity is ?=9.81.

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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?”