A trailer with weight $30\,\text{kN}$ is connected to a cab at $X$, as shown in the diagram. What upward force does the cab exert on the trailer at $X$?
- A$3\,\text{kN}$
- B$15\,\text{kN}$
- C$30\,\text{kN}$
- D$60\,\text{kN}$
Physics 9702 · AS & A Level · Equilibrium of forces