A tray of mass (M) 12 kg is supported by a spring as shown in the figure.
When the tray is pressed down and released, it executes SHM with a period of 1.5 s. When a block of mass m placed on the tray, the period of SHM changes to 3.0 s. The mass of block is
A particle executes SHM with a frequency f. The frequency with which its kinetic energy oscillates is
A simple pendulum is placed inside a lift, the lift is moving with a uniform acceleration. If the time periods of the pendulum while the lift is moving upwards and downwards are in the ratio of 1 : 3, then the acceleration of the lift is
[Take acceleration due to gravity, g = 10 m/s2]