JEE Main Physics question

PhysicsOscillationsJEE Main

A coin is placed on a horizontal platform which undergoes 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 [AIEEE 2006]

Answer: (D)

Solution

Contact is lost where the required downward acceleration for SHM would exceed g, i.e. where ω²y > g. This condition is reached earliest, as amplitude is

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Question ID VK-152855