posted by Hannah .
1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces are present: friction does -1.82 x 104 J of work on the car, and a chain mechanism does +5.49 x 10^4 J of work to help the car up a long climb. What is the change in the car's kinetic energy KEf - KEo from A to B?
Would I multiply both the distance and work done for both A and B and then subtract them?