A 15.0-m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0° angle with the horizontal. If the ladder is just on the verge of slipping when a firefighter (weighing 800 N) is 9.00 m up, what is the coefficient of friction between the ladder and ground?

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Center of Gravity of a system

The centre of gravity is a property that is based on the geometry of a rigid body or any particle. It is described as an equilibrium point or a hypothetical location where the total weight of the body is concentrated.