The distance between planets varies as they move in their orbits. the minimum distance from the earth to mars is about 0.35 au. about how many kilometers is that?
15,000,000 km
25,000,000 km
55,000,000 km
70,000,000 km

C- 55,000,000 km
Earth to Mars is 54.6 million km, but rounded up equals 55 million.

Centrapedial force is the answer

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.