# Time Domain Analysis – 6

6. For a second order system

$\dpi{100} \dpi{100} \large \dpi{100} 2\tfrac{d^{2}y}{dt^{2}}+4\tfrac{dy}{dt}+8y=8x$

The damping ratio is :

(a) 0.1
(b) 0.25
(c) 0.333
(d) 0.5