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