Water enters through end A with speed 
and leaves through end B with speed 
of a cylindrical tube AB. The tube is always completely filled with water. In case I tube is horizontal and in case II it is vertical with end A upwards and in case III it is vertical with end B upwards. We have 
for
Text Solution
Verified by ExpertsThe correct answer is:
D
This happens in accordance with equation of continuity and this equation was derived on the
principle of conservation of mass and it is true in every case, either tube remain horizontal or vertical.
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