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**PLEASE HELP! in Deriving Terminal Velocity Equation :)**

**1. Homework Statement**

The terminal velocity of a mass m, moving at 'high speeds' through a fluid of density

ρ(kg m^-3), is given by v = sqrt(2mg/DρA) where A is the cross sectional area of the object (m^2) and D a dimensionless "drag coefficient".

i) Show that equation is dimensionally correct

ii) Estimate the terminal velocity of an Australian $1 coin. Take D to be ~0.3.

**2. Homework Equations**

v = sqrt(2mg/DρA)

**3. The Attempt at a Solution**

I'm completely stuck. I have no clue as in how to even start. I'm so sorry :(