A mobile at the Ontario Science Center has a 2.0 kg plastic cat and a 4.0 kg plastic dog, suspended as shown in the figure. Angle 1 = 20 degrees when the center rope is adjusted to be perfectly horizontal. Calculate the tension and the angle of rope 3?

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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?”