The uniform ladder in Fig. 2 weighs 0.6kN. If

x = 4m, how large must the coefficient of friction against the ground be for the ladder not to slip down? If the

coefficient of friction is m = 0.5, show that the ladder will only fall when the man climbs up to x = 2.8m or a height

of 3.5m above the ground!

Now I think I'm correct in saying, at A, there's a vertical reaction pointing upwards and a horizontal reaction pointing to the right? At B there's a horizontal reaction pointing left? I worked out the reactions and got FAy=1.6Kn, FAx=1.04Kn, FBx=1.04Kn. Just got stuck at the last part where its asking for the coefficient of friction. Could anyone explain how to answer the last part of the question? Cheers.