You are given an 8.00 kg box resting on a spring. The spring is compressed 7.0 cm by the box. (a) What is the spring constant? ____ N/cm (b) The box is pushed down an additional 30.0 cm and released. What is the elastic potential energy of the compressed spring just before that release? ____ J (c) What is the change in the gravitational potential energy of the box-Earth system when the box moves from the release point to its maximum height? ____ J (d) What is that maximum height, measured from the release point? _____ m ------------------- I've got part A) which is 11.2 N/cm, I believe... but I'm having trouble getting past this.... help anyone????