What happens to the energy of a simple harmonic oscillation if its amplitude is doubled?

The total energy of a simple harmonic oscillation is proportional to

When the displacement of a simple harmonic oscillator is half of its amplitude, its potential energy is 3J. Its total energy is

The total energy of simple harmonic oscillator is E and amplitude is 'A'. It the kinetic energy is 3E/4 without altering the amplitude. The displacement of the oscillator is

If amplitude of velocity is V_0 then the velocity of simple harmonic oscillator at half of the amplitude is

If amplitude of velocity is V_0 then the velocity of simple harmonic oscillator at half of the amplitude is