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Figure shows a hollow cube of side 'a' a...

Figure shows a hollow cube of side `'a'` and volume `'V'`. There is a small chamber of volume `V//4` in the cube as shown. The chamber is completely filled by in kg of water. Water leaks through a hole `H` and spreads in the whole cube. Then the work done by gravity in this process assuming that the complete water finally lies at the bottom of the cube is

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