A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of $g/3,$  the fraction of volume immersed in the liquid will be
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(a)Fraction of volume immersed in the liquid ${V_{in}} = \left( {\frac{\rho }{\sigma }} \right)V$ i.e. it depends upon the densities of the block and liquid.
So there will be no change in it if system moves upward or downward with constant velocity or some acceleration.
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