Posted by **Chong** on Tuesday, November 6, 2012 at 4:16am.

A 15 kg uniform ladder leans againt a wall in the atrium of a large hotel. The ladder is 8m long, and it makes an angle as 60 degree with the floor. The coefficient of static friction between the floor and the ladder is u+ 0.45. Assume the wall is frictionless.

a) How far along the ladder can a 60kg painter climb before the ladder starts to slip?

b) Therefore, at where height above the ground can the same painter climb before the ladder starts to slip ?

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