The phase difference between the instantaneous velocity

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

1. π
2. 0.707 π
3. zero
4. 0.5 π

Correct Option: D

Let y = A sin ωt

v_inst =	dv	= Aω cos ωt = Aω sin{ωt + (π / 2)}
	dt

Acceleration = - Aω² sin ωt
= Aω² sin(π + ωt)

∴ φ =	π	= 0.5π
	2