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
AIIMS 2011, Easy
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The time taken by particle from left extreme to right extreme $= 0.5\, T.$
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