Ashley walks 800 meters along a straight northerly path to school. upon reaching the school building, she realizes she forgot her lunch and runs home (along the same path) to get it. in order to make it back to school on time, she roller-skates back to the school, again along the same path. what distance did ashley travel? 800 meters 1,600 meters 2,400 meters 0 meters

First, Ashley walked 800 m to school, then she returned home traversing again 800 m, then she returned to school, again, traversing 800 m, all along the same path. When we sum those values we get: 800 m + 800 m + 800 m = 2400 m. So Ashley traveled a distance of 2400 m. 

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.

Answerboth technicians (a) and (b);