Problem 3: The system shown in the figure below has an undamped torsional natural frequency of 5 Hz for the following data: m = 10 kg, Jo = 5 kg. m², r₁ = 10 cm and r2 = 25 cm. E x(t) 0000 Pulley, mass moment of inertia Jo When the system is disturbed by giving it an initial displacement, the amplitude of free vibration is reduced by 80% in 10 cycles. Determine the values of k and c.