Three identical (massless) springs are hung from the ceiling. Spring 1: Nothing hung from spring. The spring's bottom is 0.1 m below the ceiling. Spring 2: A 7 N object is hung from the spring. The spring's bottom is 0.7 m below the ceiling. Spring 3: An object of unknown weight is hung from the spring. The spring's bottom is 0.8 m below the ceiling. a.) Find the spring constant that each spring has.