A fisherman's scale stretches 3.0 cm when a 2.4-{rm kg} fish hangs from it. What is the spring stiffness constant? What will be the amplitude of oscillation if the fish is pulled down 3.4 cm more and released so that it oscillates up and down? What will be the frequency of oscillation if the fish is pulled down 3.4 cm more and released so that it oscillates up and down?