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In a horizontal spring - mass system mas...

In a horizontal spring - mass system mass `m` is released after being displaced towards right by some distance `t = 0` on a friction-less surface. The phase angle of motion in radian when it is first time passing through equilibrium position is equal to

A

`pi//2`

B

`pi`

C

`3pi//2`

D

0

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The correct Answer is:
B
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