4. An electronic module inside an aircraft must be mounted on an elastic pad to protect it from vibration of the airframe. The module weighs 200 N. The elastic property of the pad is such that the natural frequenct is 65 rad/s.. (a) Find spring constant k of the elastic pad, (b) If the airframe's motion has a frequency of 40 Hz, calculate the percent of the airframe's motion transmitted to the module. Neglect damping effect. Electronic module Air frame Elastic pad