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Earth Sciences 10 Online
sxdsouls:

Two movers use a rope system to lift a box to a third-story apartment. They do 1,200 J of work on the rope system, and the rope system does 1,020 J of work on the box. What is the efficiency of the rope system? The efficiency of the rope system is _ %.

sxdsouls:

not even sure on the subject-

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