The total mechanical energy of a particle in $SHM$ is
  • A
    Always constant
  • B
    Depend on time
  • C$\frac{1}{2}\,K{A^2}\,{\cos ^2}\,(\omega t\, + \,\phi )$
  • D$\frac{1}{2}\,m{A^2}\,{\cos ^2}\,(\omega t\, + \,\phi )$
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