In a horizontal spring-mass system, mass \( m \) is released after being displaced towards right...

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In a horizontal spring-mass system, mass \( m \) is released after being displaced towards right by some distance at \( t=0 \) on a frictionless surface. The phase angle of the motion in radian when it is first time passing through the equilibrium position is equal to :
(A) \( \pi / 2 \)
(B) \( \pi \)
(C) \( 3 \pi / 2 \)
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