Starting from the mean position a body oscillates simple harmonically with a period of $2\,s.$ After what time will its kinetic energy be $75\%$ of the total energy ?
  • A$\frac {1}{6}\,s$
  • B$\frac {1}{4}\,s$
  • C$\frac {1}{3}\,s$
  • D$\frac {1}{12}\,s$
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