The radius r of a given sphere decreases at the rate of 2 cm/s. Find the rate of change in its volume with respect to time when r = 0.5 cms.

\[-2\pi \] \[2\pi \] \[-4\pi \] \[4\pi \]

\[-2\pi \]

dV/dt = \[-8\pi { r }^{ 2 } \]