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3 When a particle of mass m is attached to a vertical spring of spring constant k and released, its motion is described by y(t) = y 0 sin 2  t, where 'y' is measured from the lower end of unstretched spri ng. Then  is :

1. 0 y g
2. 0 y 2 g
3. 0 y g 2 1
4. 0 y g 2

Correct answer: 0 y 2 g

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