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Acceleration of objects suspended with a pulley

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The system consists of 2 objects of Masses M and m and m<M suspended with ideal string over a massless, frictionless pulley. What is acceleration of each object?

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Step by step explanations of Atwood's machine.

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Tension in the cord must be less than the weight of mass M (otherwise it would not fall from rest) and greater than the weight of mass m (otherwise it will not move up).
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