Question

the total energy in a system is 675 j. the kinetic energy changes from 296 j to 432 j. which statement best describes the potential energy of this system? it changes from 296 j to 432 j. it changes from 379 j to 432 j. it changes from 432 j to 296 j. it changes from 243 j to 379 j.

Explanation:

Step1: Recall energy - conservation formula

The total energy $E$ of a system is the sum of kinetic energy $K$ and potential energy $U$, i.e., $E = K+U$.

Step2: Calculate initial potential energy

Given $E = 675$ J and initial $K_1=296$ J. Using $U_1=E - K_1$, we have $U_1=675 - 296=379$ J.

Step3: Calculate final potential energy

Given final $K_2 = 432$ J. Using $U_2=E - K_2$, we have $U_2=675 - 432 = 243$ J.

Answer:

It changes from 379 J to 243 J.