Displacement at which potential energy is 8 times kinetic energy

1. A.
   $\frac{A\sqrt{2}}{3}$
2. B.
   $\frac{A}{3}$
3. C.
   $\frac{2\sqrt{2}A}{3}$
4. D.
   $\frac{A}{2}$

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1. A.
   $\dfrac{2}{\sqrt{3}}A$
2. B.
   $\dfrac{\sqrt{2}}{3}A$
3. C.
   $\dfrac{2\sqrt{2}}{3}A$
4. D.
   $\dfrac{3}{\sqrt{2}}A$

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