A car moves on a horizontal road at a constant speed. There are three horizontal forces acting on the car. The diagram shows two of these forces. What are the magnitude and direction of the third horizontal force acting on the car?
- A$1200\,\text{N}$ backwards
- B$1200\,\text{N}$ forwards
- C$1800\,\text{N}$ backwards
- D$1800\,\text{N}$ forwards