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?

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The unit step response of a second order system is = 1-e-5t-5te-5t . Consider the following statements:<br>1. The under damped natural frequency is 5 rad/s.<br>2. The damping ratio is 1.<br>3. The impulse response is 25te-5t.<br>Which of the statements given above are correct?