39. A golden delicious apple of mass 0.10 kg from Mr. Sawinski's back yard is attached to a vertical spring with a force constant of 10.6 N/m. The apple is held so that the spring is at its unstretched equilibrium position then it is allowed to fall. Neglect the mass of the spring and its kinetic energy. a) How much elastic potential energy is stored in the spring when the apple has fallen 10.0 cm? [2 marks] b) What is the speed of the apple when it has fallen 10.0 cm? [4 marks]