A particle is executing $S.H.M.$ with total mechanical energy $90 \,J$ and amplitude $6 \,cm$. If its energy is somehow decreased to $40 \,J$ then its amplitude will become ........ $cm$
  • A$2$
  • B$4$
  • C$\frac{8}{3}$
  • D$\frac{4}{3}$
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