9) A projectile is launched at an angle of 30° above the horizontal. Neglecting air resistance, what are the projectile's horizontal and vertical velocity when it reaches its maximum height? a. Both the horizontal and vertical velocity are zero. b. The horizontal acceleration is zero and the vertical acceleration is 9.81 m/s
c. The horizontal velocity is V. V cost and the vertical volocity is vero.
d. Both the horizontal and vertical velocity are 9.81 m/s2

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.

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Ibelieve the answer is d. densityhope my answer has you : )