A 70kg adult sits at one end of a 9.0m long board. Their 23kg child sits on the other end. A. Where should the pivot be placed so the board is balanced (as distance from adult). Ignore the boards mass. B. Find the pivot point if the board is uniform and has a mass of 15kg.

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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.