A uniform ladder is leaning against a vertical wall with negligible friction. Its lower end is on rough ground, so friction acts at the base. The top of the ladder is at a height $h$ above the ground, and the foot of the ladder is $2a$ from the wall. The diagram shows the forces acting on the ladder. Which equation results from taking moments?
- A$Wa + Fh = 2Wa$
- B$Fa + Wa = Fh$
- C$Wa + 2Wa = Fh$
- D$Wa - 2Wa = 2Fh$