Two springs joined one after the other (in series) carry a load: total extension

1. A.
   $f\!\left(\frac{1}{K_1} + \frac{1}{K_2}\right)$
2. B.
   $f\!\left(\frac{1}{K_1} - \frac{1}{K_2}\right)$
3. C.
   $f(K_1 + K_2)$
4. D.
   $f(K_1 - K_2)$

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1. A.
   $F(K_1 + K_2)$
2. B.
   $F(1/K_1 - 1/K_2)$
3. C.
   $F(K_1 - K_2)$
4. D.
   $F(1/K_1 + 1/K_2)$

Tap an option to check your answer.