The Ejection Seat at Lake Biwa Amusement Park in Japan (Figure 1) is an inverse bungee system. A seat with passengers of a total mass of 160 kg is connected to elastic cables on the sides. The seat is pulled down 12.0 m, stretching the cables. When released, the stretched cables launch the passengers upward above the towers to a height of about 30.0 m above their starting position at the ground. Assume that the cables are vertical. Determine the spring constant of the cable.