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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 answer: 0.5 π

Solution

In simple harmonic motion, velocity and acceleration are out of phase by 90° or π/2 radians. This is because acceleration is proportional to the negative of displacement, while velocity is the derivative of displacement.

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