A system is made up of a pulley of radius a with no friction and mass , as well as a massless string of length L that is tied to some point masses m1 hanging on the left and some point masses m2 hanging on the right. Determine the system's acceleration by expressing it with a single degree of freedom.

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Q: A

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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?”