3. [3 potnts] When the muzzle veloctty of a projectile 1s found, the spring constant k of the projectile launcher can be determined ustng the conservation of energy. The energy stored in a spring Is given by Uringr2 where x is the compression of the spring. When the projectle launcher fires, the energy stored in the sprtng is transferred to the kinetilc en- ergy of the ball. That Is: 0.2) 0.3) because of the conservation of energy Data are collected for several spring compression lengths and the resulting projectle velocity Is measured. Using Equation o.3, what can be plotted to obtain a straight-ltne relationshtp from which the value of k can be obtained? Support your answer by explictly showing hows to the resulting parameters of the line fit.