A plate of mass m is supported by a light spring fixed vertically on the ground. A plasticine is dropped gently onto the block when it is are the highest position. Which of the following statements is/are correct? 1) The amplitude of the oscillation would increase since the equilibrium position is lowed. (correct) 2) The amplitude of the oscillation would also increase if the plasticine is dropped gently onto the block when it is at the lowest position. (incorrect) I don't know why. I also compare the question with the one that is similar: For a mass-spring system resting on a smooth horizontal surface, amplitude decreases if a plasticine is dropped onto the mass when it is at the equilibrium position. When should I consider the equilibrium position and when should I consider the total mass? Thanks a lot.