A) \[a\]
B) \[{{a}^{2}}\]
C) \[{{a}^{3}}\]
D) \[{{a}^{-1}}\]
Correct Answer: B
Solution :
If a spherical body of radius a is dropped in a viscous fluid, it is first accelerated and then its acceleration becomes zero and it attains a constant velocity called terminal velocity. Terminal velocity, \[v=\frac{2}{9}\frac{{{a}^{2}}(\rho -\sigma )g}{\eta }\]where p is the density of the body, o is the density of fluid and \[\eta \] is coefficient of viscosity.
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