The displacement of simple harmonic oscillator after $3$ seconds starting from its mean position is equal to half of its amplitude. The time period of harmonic motion is $\dots \; s$
A$6$
B$8$
C$12$
D$36$
JEE MAIN 2022, Medium
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D$36$
d $X=A \sin \omega t\left(t=3, X=\frac{A}{2}\right)$
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