The net acceleration that can be supported by the mass is specified. It allows for calculation of the requisite natural frequency. Net accelerations of the defined magnitude occur with the specified shock when the system is tuned to this natural frequency. At higher natural frequencies the net accelerations rise, at lower natural frequencies the net accelerations drop.
The spring stiffness required can be worked out on the basis of the natural frequency calculated and the know static load per mounting point. The appropriate mounts must now be selected and verified with the mounts selected and the calculation.