Consider the basic oscillator shown below for the case where m= 5 kg, k = *C* N/m, c = 68 Ns/m. www E a) What is the total stiffness of the system? b) Calculate the damping ratio of the system. m www wwww k [2 marks] [2 marks] The mass is initially displaced by 25 mm and then released into damped, unforced oscillation. c) Calculate the frequency of the resultant oscillations in hertz. [3 marks] d) Calculate the amplitude of the oscillation after 5 complete cycles. How long do these 5 cycles take to complete in total in seconds?