The unit step response of a second order system is = 1-e-5t-5te-5t . – McqOptions

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1.	The unit step response of a second order system is = 1-e-5t-5te-5t . Consider the following statements:1. The under damped natural frequency is 5 rad/s.2. The damping ratio is 1.3. The impulse response is 25te-5t.Which of the statements given above are correct?
A.	Only 1 and 2
B.	Only 2 and 3
C.	Only 1 and 3
D.	1,2 and 3
Answer» E.

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