From the image of a graph given, what is the energy in flywheel at E, if the energy at A is x and an are the energies in the regions above and below the mean torque lines as indicated in the diagram.
1
x + a1 + a2 + a3 + a4
2
x - a1 - a2 - a3 - a4
3
x - a1 + a2 - a3 + a4
4
x + a1 - a2 + a3 - a4