The Following Formulas Are Supposed to Describe the Speed $V$ Of a Sphere Sinking in a Thick Fluid

Multiple Choice

The following formulas are supposed to describe the speed $V$ of a sphere sinking in a thick fluid. $C$ is a unitless constant, $\rho$ is the fluid's density in $\mathrm{kg} / \mathrm{m}^{3}, A$ is the sphere's cross-sectional area, $m$ is its mass, and $g$ is the gravitational field strength in $\mathrm{N} / \mathrm{kg}$ . Which could be right?

A) $v=C A \rho g$
B) $v=C m g / \rho A$
C) $v=(C m g / \rho A) ^{2}$
D) $v=(C m g / P A) ^{1 / 2}$
E) None of these can be correct.