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A 70 kg person stands on a 30 kg platform and pulls on a massless rope with a force of 400 N. The rope passes around a pulley attached to a support (roof), and then around a second pulley attached to the platform before being anchored to the support (roof). All sections of the rope are vertical. Both pulleys are massless and frictionless.

What is the acceleration of the system? What is the person's apparent weight?

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