1. The problem statement, all variables and given/known data A horizontal spring of force constant 12 N/m, is mounted at the edge of a lab bench to shoot marbles at targets on the floor 93.0cm below. A marble of mass 8.3 x 10^-3 kg is shot from the spring, which is initially compressed a distance of 4.0 cm. how far does the marble travel horizontally? i can see how i can calculate this, but im not sure what the energy statment is in this question originally i stated that Eelastic + Eg = Ek but that didnt work I tried Eelastic = Ek and that worked. but it dosent make sense why Eelastic + Eg = Ek dosent work. initially the ball is off on a table. so there should be gravitational potential energy...but why dosent it work with calculation?