(Figure 1) shows the potential-energy diagram and the total energy line of a particle oscillating on a spring. The left end of the spring is fixed at x = 0 cm. Figure Energy (J) 20- PE 15- 10- 5 TE 0 T x(cm) 12 16 20 24 28Part A What is the spring's equilibrium length?Part B Where are the turning points of the motion? Express your answers in centimeters. Enter your answers in ascending order separated by a comma.Part C What is the particle's maximum kinetic energy? Express your answer with the appropriate units.Part D What will be the turning points if the particle's total energy is doubled? Express your answers in centimeters. Enter your answers in ascending order separated by a comma