A close-coiled helical spring of stiffness 30 N/mm is arranged in series with another such spring of stiffness 60 N/mm.
Question 1:
A close-coiled helical spring of stiffness 30 N/mm is arranged in series with another such spring of stiffness 60 N/mm. The stiffness of composite unit is
A.20 N/mm
B.30 N/mm
C.45 N/mm
D.90 N/mm
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