A spring-mass system is subjected to Coulomb damping. When a harmonic force of amplitude \(120 \mathrm{~N}\) and frequency \(2.5173268 \mathrm{~Hz}\) is applied, the system is found to oscillate with an amplitude of \(75 \mathrm{~mm}\). Determine the coefficient of dry friction if \(m=2 \mathrm{~kg}\) and \(k=2100 \mathrm{~N} / \mathrm{m}\).