How would you convince somebody that the momentum of an isolated system is constant? Check all that apply.

A. Derive it from Newton's second and third laws.

B. Use it to make predictions about a experiment (for example, collision of two bodies), and then compare the outcome to the prediction.

C. Use an example from a textbook to show that the sum of the initial and final velocities of the objects involved in a collision are the same.

D. It is a postulate; thus, you do not need to convince anybody.

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

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.