To control the vibration of a 1DOF oscillator consisted of mass m1 = 100 kg and spring k1 = 10kN/m, adetuner is used. It is known that the mass of the detuner m2 = 30 kg. Determining the stiffness of thedetuner spring k2 for the following excitation conditions: Case 1: periodic force applied on m1 at 5 Hz; Case 2: impact force applied on m1 . Hint: impact force excites the vibration at resonance frequency