The displacement of a particle is represented by the equation
Y = sin3 ωt. The motion is
We know that, ![]()
Thus, we can write, 
Now differentiating the above twice we get,

But
is not proportional to ![]()
Thus, it is not a SHM, but since there is a sine term, thus the motion will be periodic.
And
, thus 
Hence option (b) is correct.
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