10kg undamped-absorber which is tuned to 100rad/sec is added to first-DOF structure of stiffness 5x10^6 N/m, the lowest natural frequency of structure is 85.44 rad/sec. What's the higher natural frequency of structure?

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10kg undamped-absorber which is tuned to 100rad/sec is added to first-DOF structure of stiffness 5x10^6 N/m, the lowest natural frequency of structure is 85.44 rad/sec. What's the higher natural frequency of structure?
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