A connecting rod of length \(400 \mathrm{~mm}\) between centres has a mass of \(4.5 \mathrm{~kg}\). The centre of gravity is \(260 \mathrm{~mm}\) from the small end and its radius of gyration about an axis through the centre of gravity perpendicular to the plane of rotation is \(125 \mathrm{~mm}\). Determine a dynamically equivalent system having one mass at the centre of small end and the other at a point somewhere in between the centre of big end and the centre of gravity.