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I am currently trying to work out the drag coefficient of a car, I know the formulae to work out CD, this being CD=FD/0.5xρv^2A. I can not figure out how to find FD as the formulae for this requires CD. Is there another way to find FD? The information I have is as follows:

Car Mass: 1350 kg

Rolling Resistance: 400 N

Cross Sectional Area: 2.2 m^2

Density of Air: 1.23 kg m^-3

Hill Gradient: 3.18 degrees

To find CD the equation below is used

CD=FD/0.5xρv^2A

However to find FD CD is required

AN ATTEMPT AT THE SOLUTION WOULD BE

?FD?/0.5 x 1.23 kg/m^3 x 24.590 m/s^2 x 2.2

It is just the FD part I am not too sure about.

I would greatly apprecitate any help offered as I am now completely stumped.

Thanks