Question

What is the equivalent spring stiffness for the system of springs shown in the figure given below?

• A. 43 kN/m
• B. 50 kN/m
• C. 58 kN/m
• D. 64 kN/m

Answer 1

The correct option is C 58 kN/m

Spring of 10 kN/m stiffness and 40 kN/m stiffness are in series. They will have equivalent stiffness of $\frac{10\times 40}{10+40}=8kN/m$.

Now 20 kN/m, 8 kN/m and 30 kN/m stiffness springs will be in parallel so the equivalent spring stiffness will be 20 + 8 + 30 = 58 kN/m