8. A 2000 kg pickup truck is moving at a speed of 40 m/s as its breaks are applied and comes to a stop in 10 s. What is the breaking force applied to the truck? (Hint: Remember the equations from the last unit Find
acceleration first.)

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.