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A particle executes simple harmonic motion with an amplitude of 5 cm. When the particle is at 4 cm from the mean position, the magnitude of its velocity in SI units is equal to that of its acceleration. Then, its periodic time in seconds is -

1. 3 4 π
2. 8 3 π
3. 3 7 π
4. 3 8 π

Correct answer: 3 8 π

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