Question: How to get my function to use V=[vx,vy]

I've got a rain drop falling through air with velocity V=[vx,vy] when exposed to to dragforce Fd

formulas in following link 



But  Fd= (expression for dragforce*v)* V

How to multiply V=[vx,vy] and recive list for all values so i can make a plot with this values?

need to use Cd= V ->and returns Cd(v) (not proc..)






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