A simple pendulum of length $1\,m$ is allowed to oscillate with amplitude $2^o$. It collides elastically with a wall inclined at $1^o$ to the vertical. Its time period will be : (use $g = \pi ^2$ )
  • A$2/3\,sec$
  • B$4/3\,sec$
  • C$2\,sec$
  • D
    None of these
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