It is pretty clear from archimedes that how an object behaves in terms of floating and sinking when submerged in a liquid is cleary a matter of density of both the object and the liquid. SO consider an infinitely big aquarium , in front of which a man is standing ; the man somehow throws balls into the middle of the aquarium with a finite horizontal velocity. These balls have a density that is equal to that of the liquid in the aquarium . These balls will stop after some time , but after the balls have stopped will they continue to rise vertically in the aquarium ? some time later ............... the same man throws balls vertically into a river . this time also the balls have same velocity as that of water. When the balls stop will rise up or remain at that position where they have stopped ?
the Archimedes principle tells me that they will not rise but remain at that spot. I just need a reassurance !
Also i need to clarify one more fact ; if thrown vertically in a big body of water, is it possible for a object with a greater density than that of water to stop midway in the river due to greater density at that point or does this type of object have a enough water level above it which will cancel out the effects of the greater density below ?