d
(d) Harmonic oscillator has some initial elastic potential energy and amplitude of harmonic variation of energy is \(\frac{1}{2}K{a^2} = \frac{1}{2} \times 2 \times {10^6}{(0.01)^2} = 100\,J\)
This is the maximum kinetic energy of the oscillator. Thus \({K_{\max }} = 100J\)
This energy is added to initial elastic potential energy may give maximum mechanical energy to have value \(160J\).