Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

Two closely coiled helical springs with stiffness k₁ and k₂ respe

1.	Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by
A.	(k₁ k₂)/ (k₁ + k₂)
B.	(k₁ - k₂)/ (k₁ + k₂)
C.	(k₁ + k₂)/ (k₁ k₂)
D.	(k₁ - k₂)/ (k₁ k₂)
Answer» B. (k₁ - k₂)/ (k₁ + k₂)

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Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

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