A lead shot of $1mm$  diameter falls through a long column of glycerine. The variation of its velocity $v$. with distance covered is represented by

Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure $p$  at points along the axis is represented by

A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram

Write the equation of terminal velocity.

A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best  described in the figure drawn by:-