Displacement between maximum potential energy position and maximum kinetic energy position for a particle executing simple harmonic motion is

When an oscillator completes 100 oscillations its amplitude reduced to $${1 \over 3}$$ of initial value. What will be its amplitude, when it complettes 200 oscillations ?

The total energy of particle performing SHM depend on

The bob of simple pendulum having length $$l$$, is displaced from mean position to an angular position q with respect to vertical. If it is released, then velocity of bob at equilibrium position