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Homework Statement
The double Atwood machine shown in the figure has frictionless, massless pulleys and cords.
http://session.masteringphysics.com/problemAsset/1057076/4/GIANCOLI.ch04.p56.jpg
Determine the acceleration of masses mA, mB, and mC.
Homework Equations
F=ma
The Attempt at a Solution
don't know how to start