A 5 kg mass, (mass A), and a 7 kg mass, (mass B), are connected to a lightweight cord that passes over a frictionless pulley. The pulley only changes...
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A 5 kg mass, (mass A), and a 7 kg mass, (mass B), are connected to a lightweight cord that passes over a

frictionless pulley. The pulley only changes the direction of the force exerted by the rope. THe hanging masses are free to move. What is the acceleration of mass A if the gravity acts in the negative direction?

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