A coin is placed on a horizontal platform which under goes vertical simple harmonic motion of angular frequency ω). The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time:

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for an amplitude of g2ω2

at the highest position of the platform

at the mean position of the platform

for an amplitude of gω2

answer is D.

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Detailed Solution

The coin will be just leaving the contact at the lowest position when mω2A≥mg⇒A≥gω2

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