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$G(s)=\frac{as+1}{s^{2}}$
With the value of '$a$' set for a phase-margin of $\frac{\pi}{4}$, the value of unit-impulse response of the open-loop system at $t=1$ second is equal to
1. $3.40$
2. $2.40$
3. $1.84$
4. $1.74$