[" A coin is placed on a horizontal platform undergoes vertical simple harmonic motion of angular "],[" frequency "omega" .The amplitude of oscillation is gradually increased.The coin will leave contact with the "],[" platform for the first time: "],[[" (1) at the highest position of the platform "," (2) at the mean position of the plattorm "],[" (3) for an amplitude of "(g)/(omega^(2))," (4) for an amplitude of "(g^(2))/(omega^(2))]]