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A 5.8- kg concrete block rests on a level table. A 3.9- kg mass is attached...

A 5.8- kg concrete block rests on a level table. A 3.9- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.4 m/s2, what is the coefficient of friction between the block and the table?

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