Q 11-09-155NEETNEET 2022Top questionEasy
A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball ($v$) as a function of time ($t$) is
Answer: (C) B
The ball starts from rest. As it speeds up, the viscous drag ($6\pi\eta r v$) grows, so the net force and the acceleration fall.
The speed therefore rises quickly at first, then more and more slowly, and levels off at the terminal velocity. Curve B has exactly this shape.
Solution by Sreeraj P, M.Sc Physics