If you throw a baseball at 50 miles per hour north from a train moving at 40 miles per hour ‘north, how fast would theball be moving as measured by a person on the ground? Somebody please help me with this question

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.

It maybe because uranus is made of gas but uranus has a solid core in the middle