When a load of 10 kg is suspended on a m...

When a load of 10 kg is suspended on a metallic wire, its length increase by 2 mm. The force constant of the wire is

`3xx10^4 N//m`

`2.5xx10^3N//m`

`5xx10^4N//m`

`7.5xx10^3 N//m`

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