Posted by **Grace** on Sunday, February 24, 2013 at 8:49pm.

A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs 75% of the way up the ladder when it begins to slip. What is the static friction coefficient ladder/ground?

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