A particle of mass $4 \,kg$ moves simple harmonically such that its $P E(U)$ varies with position $x$, as shown. The period of oscillations is ............
  • A$\frac{2 \pi}{25} s$
  • B$\frac{\pi \sqrt{2}}{5} s$
  • C$\frac{4 \pi}{5} s$
  • D$\frac{2 \pi \sqrt{2}}{5} s$
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