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Q6. A. Explain why the bilging of empty double-bottom or deep tanks below the waterline leads to an increase in GM. (6)

B. A ship of 10,000 tonnes displacement has GM = 0.5 metres. The period of roll in still water is 20 seconds. Find the new period of roll if a mass of 50 tonnes is discharged from a position 14 metres above the centre of gravity. (10)