Water enters through end A with speed v_1 and | vedclass

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(D) According to the equation of continuity for an incompressible fluid,the product of the cross-sectional area $A$ and the velocity $v$ of the fluid

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(D) According to the equation of continuity for an incompressible fluid,the product of the cross-sectional area $A$ and the velocity $v$ of the fluid remains constant at all points along the tube,i.e.,$A_1 v_1 = A_2 v_2$.Since the tube is cylindrical,the cross-sectional area is uniform throughout,meaning $A_1 = A_2$.Therefore,$v_1 = v_2$ must hold true regardless of the orientation of the tube (horizontal or vertical).This principle is based on the conservation of mass,which applies to all three cases.

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