1.The force on a body executing SHM is 2 N when the displacement in 3 cm. When the displacement value of its acceleration is

2.The maximum energy of a body executing SHM of amplitude 2 cm is E. If the same body executes SHM of amplitude 3 cm but same period, the maximum energy will be

3.The pendulum of lengths 121 cm and 100 cm start vibrating. At some instant, the two are in the mean position in the same phase. After how many vibrations of the shorter pendulum, the two will be in the same phase in the mean position ?

4.A particle executes SHM along a straight line so that its period is 12 s. The time it takes in traversing a distance equal to half its amplitude from its equilibrium position is