Question

A metallic spherical particle of density $7001 kg/m³$ and diameter 1 mm is settling steadily due to gravity in a stagnant gas of density $1 kg/m³$ and viscosity $10⁻⁵$ kg/(m·s). Take g $= 9.8 m/s².$ Assume that the settling occurs in the regime where the drag coefficient $C_{D}$ is independent of the Reynolds number, and equals 0.44. The terminal settling velocity of the particle, in m/s, rounded off to 2 decimal places, is ____

Official answer: 14.3 to 14.6