A pole 10 m long lies on the ground next to a barn that is 8 m long. AN athlete picks up the pole, carries it far away and then runs with it towards the barn at speed 0.8c. The athlete's friend remains at rest, standing by the open door of the barn.

Sorry i don’t know what to do

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.