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The effective spring constant of two springs in series is k = k₁k₂/(k₁ + k₂).

1. Effective spring constant
2. Effective time period
3. Effective acceleration
4. Effective displacement

Correct answer: Effective spring constant

Solution

The formula k = k₁k₂/(k₁ + k₂) represents the effective spring constant for two springs connected in series, as derived from the relationship between force and displacement in such a system.

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