The unit impulse response of a second order system is 1/6e-0.8tsin(0.6t). Then the natural frequency and damping ratio of the system are respectively.

The unit impulse response of a second order system is 1/6e-0.8tsin(0.6

1.	The unit impulse response of a second order system is 1/6e-0.8tsin(0.6t). Then the natural frequency and damping ratio of the system are respectively.
A.	t1 and 0.6
B.	t1 and 0.8
C.	t2 and 0.4
D.	t2 and 0.3
Answer» C. t2 and 0.4