The displacement of a particle undergoing $SHM$ of time period $T$ is given by $x(t) = x_m\,cos\, (\omega t + \phi )$. The particle is at $x = -x_m$ at time $t = 0$. The particle is at $x = + x_m$ when
  • A$t = 0.25\, T$
  • B$t = 0.50\, T$
  • C$t = 0.75\, T$
  • D$t = 1.00\, T$
AIIMS 2011, Easy
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