A particle executes harmonic motion with an angular velocity and maximum acceleration of $3.5\, rad/sec$ and $ 7.5\, m/s^2$ respectively. The amplitude of oscillation is .... $m$
AIIMS 1999, Easy
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(d) ${A_{\max }} = a{\omega ^2} $
$\Rightarrow a = \frac{{{A_{\max }}}}{{{\omega ^2}}} = \frac{{7.5}}{{{{(3.5)}^2}}} = 0.61\;m$
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