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A coefficient of friction experiment (i.e., angle of repose experiment) is performed. A meter stick is used as an inclined plane that initially rests on a tabletop. As the meter stick is slowly inclined, a block of unknown material just starts to slide from the top of the meter stick when the block is at a vertical height of 0.4 meters above the tabletop. Calculate the coefficient of friction of the block on the plane.

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