A weightless spring of length 60 cm and ...

A weightless spring of length 60 cm and force constant `100 N m^(-1)` is kept straight and unstretched on a smooth horizontal table and its ends are rigidly fixed. A mass of 0.25 kg is attached at the middle of the spring and is slightly displaced along the length. The time period of the oscillation of the mass is

`pi/20` s

`pi/10` s

`pi/5` s

`pi/sqrt200` s

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