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Control SystemsSecond-Order Systems

For the characteristic equation s²+6s+25=0, the undamped natural frequency ωn is?

  • A3 rad/s
  • B5 rad/s
  • C6 rad/s
  • D25 rad/s
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Correct Answer: B. 5 rad/s
Explanation: Comparing with s²+2ζωn s+ωn², ωn²=25, so ωn=5 rad/s.
Reference: Standard control systems: second-order systems
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