A body is executing $S.H.M.$ When its displacement from the mean position is $4\, cm$ and $5\, cm$, the corresponding velocity of the body is $10 \,cm/sec$ and $8\, cm/sec$. Then the time period of the body is
  • A$2\pi \,sec$
  • B$\pi /2\,sec$
  • C$\pi \,sec$
  • D$3 \pi /2\,sec$
AIPMT 1991, Medium
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