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Mathematics 12 Online
OpenStudy (anonymous):

A cable weighing 0.4 pounds per foot is attached to a small 90-pound robot, and then the robot is lowered into a 40-foot deep well to retrieve a 7 pound wrench. The robot gets out of the well (carrying the wrench) by climbing up the cable with one end of the cable still attached to the robot. How much work does the robot do in climbing to the top of the well?

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