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An object is made of glass and has the shape of a cube 0.13 meter on a side, according to an observer at rest relative to it. However, an observer moving at high speed parallel to one of the object's edges and knowing that the object's mass is 2.5 kilogram finds its density to be 8200 kg/m3, which is much greater than the density of glass. Find the moving observer speed relative to the cube?

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