() Fig. 3 shows the kinetic energy k of a simple harmonic oscillator versus its position x. The vertical axis scale is set by k = 4.00 J. (@What is the spring constant? (b) At what position its potentiol energy and kinetic energy are equal? (4+8+8) K (J) K, -12 -8 -4 4 8 12 Fig, 3 x (cm)