For a second order system, damping ratio ( ) is 0 <

1.	For a second order system, damping ratio ( ) is 0 < <1, then the roots of the characteristic polynomial are
A.	real but not equal
B.	real and equal
C.	complex conjugates
D.	imaginary
Answer» D. imaginary

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For a second order system, damping ratio ( ) is 0 < <1, then the roots of the characteristic polynomial are

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