15. A uniform ladder rests against a vertical wall where there is negligible friction. The bottom of the ladder rests on rough ground where there is friction. The top of the ladder is at a height h above the ground and the foot of the ladder is at a distance 2a from the wall.
The diagram shows the forces which act on the ladder.

Which equation is formed by taking moments?
A W a + F h = 2W a B F a + W a = F h
C W a + 2W a = F h D W a – 2W a = 2F h

Question

15.  A uniform ladder rests against a vertical wall where there is negligible friction. The bottom of the ladder rests on rough ground where there is friction. The top of the ladder is at a height h above the ground and the foot of the ladder is at a distance 2a from the wall.
The diagram shows the forces which act on the ladder.
 
Which equation is formed by taking moments?
A W a + F h = 2W a         B F a + W a = F h
C W a + 2W a = F h         D W a – 2W a = 2F h

anonymous · Answer

attachment

anonymous · Answer

For one, are you familiar with moments?