A simple vibration isolator can be considered as a combination of a spring and a damper. The transfer function between the force acting on the isolator and the displacement of the isolator is given as follow, where damping constant c-3.1 and spring constant k=8.4, calculate the rise time of the control system response under a unit step input. (please keep four digits after the decimal point) X(s) F(s) cs+k = F(t) AC C Tx x(1)