What is the required stiffness of an undamped dynamic vibration absorber whose mass is (5 mathrm{~kg}) to

Question:

What is the required stiffness of an undamped dynamic vibration absorber whose mass is $5 \mathrm{~kg}$ to eliminate vibrations of a $25 \mathrm{~kg}$ machine of natural frequency $125 \mathrm{rad} / \mathrm{s}$ when the machine operates at $110 \mathrm{rad} / \mathrm{s}$ ?

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