Blocks of mass mi and m2 are connected by a massless string that passes over the pulley in the figure (Figure 1). The pulley turns on frictionless bearings, and mass m₂ slides on a horizontal, frictionless surface. Mass m₂ is released while the blocks are at rest. ► ▶ ▶ Part B Part C Part D Part E Find the tension in the lower portions of the string. Verify that your answers agree part B if you set mp=0. Express your answer in terms some or all of the variables mi, m2, mp, and constant g.

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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?”