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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Q. 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) k1k2 k1+k2
(B) k1−k2 k1+k2
(C) k1+k2 k1k2
(D) k1−k2 k1k2

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✅ Correct Answer: (A) k1k2 k1+k2

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