The phase difference between the displacement and acceleration of a particle execuliting simple harmonic motion is

The phase difference between displacement and acceleration of a particle in a simple harmonic motion is:

What is the phase difference between the displacement and acceleration of a particle executing SHM?

The phase difference between the instantaneous Velocity and acceleration of a particle executing simple harmonic motion is

The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is:

The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is

The phase difference between the instantaneous Velocity and acceleration of a particle executing simple harmonic motion is