Two springs \(\mathrm{A}\) and \(\mathrm{B}\) \((k_A=2k_B)\) are stretched by applying forces of equal magnitudes at the four ends. If the energy stored in \(\mathrm{A}\) is \(E,\) that in \(\mathrm{B}\) is:
1. \(\frac{E}{2}\)

2. \(2E\)    

3. \(E\)

4. \(\frac{E}{4}\)

Two equal masses are attached to the two ends of a spring of spring constant k. The masses are pulled out symmetrically to stretch the spring by a length x over its natural length. The work done by the spring on each mass is

1. \(\frac{1}{2} \mathrm{kx}^{2}\)

2. \(-\frac{1}{2} \mathrm{kx}^{2}\)

3. \(\frac{1}{4} \mathrm{kx}^{2}\)

4. \(-\frac{1}{4} \mathrm{kx}^{2}\)

The negative of the work done by the conservative internal forces on a system equals the change in:
1. total energy
2. kinetic energy
3. potential energy
4. none of these

Choose the correct option from the given ones: