Could someone please help me with this question?:-)

3.1 Settling of a metal particle A spherical particle made out of aluminium (s=2.7103kg/m3) with a diameter of 1mm is settling in water. At the given condition, the viscosity of water is 1.0103kg/(ms) and the density is 1.0103kg/m3. (a) Calculate the terminal settling velocity and the particle Reynolds number under the assumption that Strokes law is valid. Is it justified to use Stokes law for the given particle? (b) Calculate the actual terminal settling velocity and the particle Reynolds without making any assumption on the drag force. Tip: Galileo-Reynolds diagram