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A couple of boxes with different masses, 5.70 kg and 2.90 kg , hang 0.700 m...

A couple of boxes with different masses, 5.70 kg and 2.90 kg , hang 0.700 m above the floor from the ends of a cord 8.00 m long passing over a frictionless pulley. The boxes are released from rest with the heavy box falling and lifting up the light box. Find the maximum height above the floor reached by the 2.90 kg box.

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