1. The problem statement, all variables and given/known data We had a lab where we launch springs with an unknown k constant to a target 2.01m away and 0.22m high. We also know the angle at which we shot the spring. We need to find the k constant of the spring, so my question is, does the kinetic energy matter? 2. Relevant equations Will the equation be: Eg + Ee = Eg + Ek (The spring had gravitational potential as it was launched a bit higher than the reference position (the table) or Eg + Ee = Eg 3. The attempt at a solution If I did the Eg + Ee = Eg method, then my k constant turned out to be 2.752 N/m. The spring's length at equilibrium is 0.04m; the spring is quite tiny. Does this k constant seem to small? Also, using F= kx, the force contained in the spring when x = 0.035m, is 0.09632N Are these values too small, which could possibly hint the method I tried is wrong?