Since viscous forces in fluid and air drag are the same in nature, both depend linearly on the object's velocity.

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Viscous forces in fluid often follow a linear relationship with velocity at low speeds (laminar flow), but air drag (a form of viscous force encountered at higher speeds or in gases) can depend on the square of the velocity, especially at higher speeds where the flow becomes turbulent.

Since Viscous Forces in Fluid and Air Drag Are the Same