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Mathematics 13 Online
OpenStudy (anonymous):

You stand 5 meters underneath a pulley. You hold in your hand a rope that loops up through the pulley and is connected to a heavy box of calculus exams which sits on the ground exactly 12 meters behind you. The rope is stretched tight at all times. You rush forward at 2 meters per second pulling the rope with you. How fast is the box moving after 2.5 seconds have elapsed?

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