A0.4 kg soccer ball approaches a player with a velocity of 18 m/s to the east. the player strikes
the ball and causes it to move in the opposite direction at a speed of 22 m/s. what impulse was
delivered to the ball by the player?

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.