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

Two closely coiled helical springs with stiffnesses k1 and k2 respecti

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

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