A coin is placed on a horizontal platform which undergoes vertical ...

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A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency \( \omega \).
\( \mathrm{P} \) The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time
W
[AIEEE 2006; AIIMS 2008]
(a) For an amplitude of \( g / \omega^{2} \)
(b) For an amplitude of \( g^{2} / \omega^{2} \)
(c) At the highest position of the platform
(d) At the mean position of the platform
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