If a particle executres S.H.M. with time...

If a particle executres S.H.M. with time period 4 s when magnitude of resotring force constant is5 `N//m` and with timper period2 s when magnitude restoring force constant is ` 20 N //m`, then time period under the combined action of two forces willl be

`4 sqrt( 5) s`

`2 sqrt(5) s`

` ( 2) /(sqrt(5)) s `

` ( 4) /( sqrt(5))s`

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