c 73 d 13 16 How long after the beginning of motion is the displacement of a harmonically oscillating point equal to one half of

Question

c 73 d 13 16 How long after the beginning of motion is the displacement of a harmonically oscillating point equal to one half of its amplitude if the period is 24 sec and initial phase is zero a 12 sec b 2 sec c 4 sec d 6 sec

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