AnswersQf(t)=2u(t)90% rise fime and setting fimey^(')(0)=y(0)=0By using the oletation for undeedamped System Solution whet 0leqslant4 < 1y_(n)(t)=Ce^(-somega_(n)^(t))sin(omega nsqrt(1-2^(2)t)+theta)for t⩾0:. Che given clamped frequency{:[omega_(d)=ch(sqrt(1-xi^(2)))] ... See the full answer