Table 1. Static Determination of the Spring Constant, k Length Average Time Mass Force, Time for 10 Time Period (T) (sec?) added to after Oscillations (sec) Period (Tav) mxg (N) the stretch, X (sec) spring, (m) m (kg) 0.000 0.000 0.000 0.000 0.150 0.100 7.07 7.10 0.200 0.130 7.58 7.55 0.250 0.170 8.60 8.59 0.300 0.210 10.10 10.11 0.350 0.240 10.60 10.59 0.400 0.280 11.11 11.12 dL From graph-1, Slope Spring constant, k = slope Work done from the F-L graph, W Elastic potential energy, U m/N dF N/m J Table2. Calculation of Effective mass Mass of spring by digital balance, M, 0.0755 kg Effective mass of the spring (take x intercept from the T? vs m graph), m. kg Mass of the spring, Mesp-3 x me Kg Percentage Error