Consider a gravity free hall in which a ...

Consider a gravity free hall in which a tray of mas M, carrying a cubical block of ice of mass m and edge L, is at rest in the middle.. If the ice melts, by what distance does the centre of mass of the tray plus the ice system descend?

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As there is gravity free after the ice melts, It would tend toacquire a phereicla shape. But, there is no exterN/Al force acting on the system. So, the centre of mass of the system

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