A particle executes SHM along a straight line with amplitude A. Consider three instants when its displacements from the equilibrium position are x=0 (point P), x=2A (point Q) and x=A (point R). Answer the following:
(i) Explain qualitatively how the kinetic energy and potential energy of the particle vary with displacement during its motion.
(ii) Arrange the points P, Q and R in ascending order of kinetic energy. Justify your answer.
(iii) Which of the three points has the greatest total mechanical energy? Give reasons for your choice.