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Relative density of ice is 0.9. Hence $90\%$ of volume of ice is immused in water.

When ice melts completely level of water does not change

Therefore the change in $CG=GG'=0.5\; cm$

Change in potential energy

$\Delta V=-mgh$

$\qquad=-(0.1)^3(900)(10)(0.5 \times 10^{-2})J$

$\qquad=-0.045\;J$

Hence d is the correct answer.

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