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  4. A small spherical solid ball is dropped from a great height in a viscous liquid. Its journey in the liquid is best described, in the diagram given below, by <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/e762189bb2b91b8dcb66791944d45cb4-.png />

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Q. A small spherical solid ball is dropped from a great height in a viscous liquid. Its journey in the liquid is best described, in the diagram given below, by
image

Mechanical Properties of Fluids

Solution:

Initially, the ball accelerates down, but its acceleration goes on decreasing till it becomes zero.
image
Thereafter it moves with critical velocity
image