1. Little Johnny is hiding in his tree house that is 10.0 meters above the ground. He is waiting in ambush for his brother, Tommy. Tommy, not knowing of his brother's location or devious plans, is napping below the tree
house.
a) If Johnny drops the balloon from rest, how long does it take to hit Tommy?
b) How fast is the balloon going when it hits Tommy?
C) If Johnny throws the balloon downwards at 2 m/s, how long does it take to hit Tommy?
d) Now, how fast is the balloon going when it hits Tommy?

The answer would be a) -80of

During the 1800s. hope this !

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.