Which of the following equation does not represent a simple harmonic motion
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(d) Standard equation of $S.H.M.$ $\frac{{{d^2}y}}{{d{t^2}}} = \, - \,{\omega ^2}y,$ is not satisfied by $y = a\tan \omega \,t$.
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$Assertion :$ In simple harmonic motion, the motion is to and fro and periodic
$Reason :$ Velocity of the particle $(v) = \omega \sqrt {k^2 - x^2}$ (where $x$ is the displacement).
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