Erich (80 kg) is trying to pull Sarah up the side of a climbing wall. Erich is at the top of the wall. The rope goes from Erich parallel to the ground, over a pulley, then down to Sarah. It is similar to the two boxes on the right. What is Sarah’s mass if Erich pulls on the rope with a force of 800 N causing him to move away from the cliff at a rate of 0.75 m/s2?

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