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Consider a causal second-order system with the transfer function


with a unit-step $R(s)=\dfrac{1}{s}$ as an input. Let $C(s)$ be the corresponding output. The time taken by the system output $c(t)$ to reach $94\%$ of its steady-state value $\underset{t\rightarrow \infty}{\lim}\:c(t),$ rounded off to two decimal places, is

  1. $5.25$
  2. $4.50$
  3. $3.89$
  4. $2.81$
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