4.2 Three point masses lie at the corners of an equilateral triangle whose sides have length 1.00 m. A 5.00 kg mass is located at the origin of the coordinate system, a 10.0 kg mass lies on the positive x-axis, and a 15.0 kg mass is in the first quadrant of the xy-plane. (a) Calculate the coordinates of the center-of-mass (CM) of the system. (b) How far is the CM from the origin, and what angle does it make with respect to the x-axis?

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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?”