A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball? A) maintains the same velocity as before

B)has one half its initial velocity

C)comes to rest

D)moves in the opposite direction

E)doubles its initial velocity

B) as the temperature increases, the kinetic energy of the particles increases.|-/

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.

Do you have the diagram?

The answer is b, i got it right on a test. hope it ; )