What is the change in internal energy if 60 J of heat is released from a system and 30 J of work is done on the system? Use AU = Q-W.
A. 90 J
B. -90 J
C. -30 J
D. 30 J

answer: point c: b. 1/2 potential, 1/2 kinetic, point a: 3/4 of its potential energy, point d or b: 3/4 potential, 1/4 kinetic

explanation: i cant explain. it's difficult to explain.

i guess it’s a and b

i believe the answer is a hope it and is correct

i dont have a visual in front of me, but i can you reason to try to get the right one. the graph should look like this, 0 to 6 there is a spike, 12 to 14 there should be a very low point. slight increase in the graph at 12 to 14, and flat 14 to 18

explanation: