Instruction Active
Reviewing Vocabulary
Match each term with the appropriate definition.
atom or molecule with a net electric charge
differentiate
most important; fundamental
ion

to distinguish between two or more objects
plasma
state of matter consisting of freely moving
ions and electrons
primary
Done
) Intro

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.