A uniform ladder is tilted against a smooth wall at an angle 60⁰ with the horizontal. The mass of the ladder is 35 kg, and its length is 9.0 m. A man of mass 75 kg is on the ladder at 2.0 m from the lower end while another man of mass 60 kg is on the ladder at 7.0 m. Calculate the friction force needed to prevent slipping.

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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.