A 5m long ladder is resting on a smooth vertical wall with its lower end 3m from the wall.what should be the coefficient of friction between the ladder and the floor for equilibrium?
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by pythogoras theorem
AB
ab2 = bc2 + ca2
ca^2=ab^2-bc^2
=5^2-3^2
ca^2=25-9
=14
coefficient is 3.74165
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