Two massless springs of spring constants $K_1$ and $K_2$ are connected in series, suspended vertically, and a mass is attached to the free end. If $x_1$ and $x_2$ are their respective extensions and $F$ is the stretching force, what is the total extension produced?
- A$F(K_1 + K_2)$
- B$F(1/K_1 - 1/K_2)$
- C$F(K_1 - K_2)$
- D$F(1/K_1 + 1/K_2)$
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