The figure shows two cases. In the first case,a spring (spring constant $K$) is pulled by two equal and opposite forces $F$ at both ends. In the second case,it is pulled by a force $F$ at one end while the other end is fixed. The extensions $(x)$ in the springs will be:

  • A
    In both cases $x = \frac{2F}{K}$
  • B
    In both cases $x = \frac{F}{K}$
  • C
    In the first case $x = \frac{2F}{K}$,in the second case $x = \frac{F}{K}$
  • D
    In the first case $x = \frac{F}{K}$,in the second case $x = \frac{2F}{K}$

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