3. A 0.30 kg object is attached to a spring which is compressed 0.80 m by a force of 80.0 N. It hits a 0.20 kg object in a perfectly inelastic collision causing the objects to fly off of the 10.5 m high platform. a)Find the k value of the spring. b)Find the elastic potential energy in the spring. c)Calculate the final speed of the objects