if the inclined plane has coefficient of friction, μ = 0.3, then 0.2 kg mass will move down with an acceleration (a) 0.2 m/s2 (b) 0.4 m/s2 (c) 2.4 m/s2 (d) 0.8 m/s2

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade

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.