A sphere is released from rest in a viscous liquid and obeys linear Stokes drag. Which statements are correct?

Select all that apply

• Option A

  Its speed approaches the terminal speed asymptotically.

• Option B

  Its acceleration decreases with time.

• Option C

  Its speed may be written as v(t) = vₜ[1-exp(-t/τ)].

• Option D

  In the simple Stokes model, τ = 2ρₛr²/(9η).