An elastic cable is to be designed for bungee jumping from a tower 130 ft high. The specifications call for the cable to be 85 ft long when unstretched, and to stretch to a total length of 100 ft when a 725−lb weight is attached to it and dropped from the tower. Determine the required spring constant k of the cable. (You must provide an answer before moving to the next part.) The required spring constant k of the cable is lb/ft.