Two massless springs of spring constant $K_1$ and $K_2$ are connected in series,suspended vertically,and a certain mass is attached to the free end. If $e_1$ and $e_2$ are their respective extensions and $f$ is the stretching force,the total extension produced is:
- A$f(K_1 - K_2)$
- B$f(\frac{1}{K_1} - \frac{1}{K_2})$
- C$f(K_1 + K_2)$
- D$f(\frac{1}{K_1} + \frac{1}{K_2})$
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