A uniform ladder
5.0 {\rm m} long rests against africtionless, vertical wall with its lower end 3.0 {\rm m} from the wall. Theladder weighs 160 {\rm N}. The coefficient ofstatic friction between the foot of the ladder and the ground is0.40. A man weighing 740 {\rm N} climbs slowly up theladder.

What is the actual frictional force when the man has climbed
1.0 m along the ladder?

will rate well, must see work
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