If a 400 n force is applied to a 10 kg object, how fast will it accelerate? a) 40 m/s2 b) 40000 m/s2 c) 4000 m/s2 d) 4 m/s2

A = F / m 
using this method of calculation your answer would be 40 m/s

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.