The drag coefficient $C_d$ is a dimensionless quantity. It is used to compare the drag acting on different cars at different speeds. $C_d$ is defined by the equation $$C_d = \frac{2F}{v^n \rho A}$$ where $F$ represents the drag force on the car, $\rho$ is the density of the air, $A$ is the car’s cross-sectional area and $v$ is the speed of the car. What is the value of $n$?
- A1
- B2
- C3
- D4