Two pencils have the same average density 500 kgm3 the mass, Ask an Expert

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Two pencils have the same average density (500 kg/m^3). The mass of the mechanical pencil is twice the mass of the conventional pencil. They are both held completely submerged under the surface of water (1000 kg/m^3) and released. Which accelerates at the greater rate? Explain your answer fully.

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