Two springs of spring constants K(1) and...

Two springs of spring constants `K_(1)` and `K_(2)` are joined in series. The effective spring constant of the combination is given by

`sqrt(k_(1)k_(2))`

`((k_(1)+k_(2)))/(2)`

`k_(1)+k_(2)`

`(k_(1)k_(2))/((k_(1)+k_(2))`

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