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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B$t = 0.50\, T$
b The time taken by particle from left extreme to right extreme $= 0.5\, T.$
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