A car moves at constant speed along a horizontal road. There are three horizontal forces acting on the car, and the diagram shows two of them. 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