MCQ

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Figure shows two cases. In first case a spring (spring constant $K$ ) is pulled by two equal and opposite forces $F$ at both ends and in second case is pulled by a force $F$ at one end. Extensions $(x)$ in the springs will be

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