Physics(Please respond)
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 nonconservative 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?

Initial PEfriction+workadded=final PE+final KE
let point A be at Height=0, point B is then (+29.43.82)
01.82E4+5.49E4=mg(29.43.82)+final KE
solve for final KE 
For the values of mg, m would be 398kg and g is 9.8 correct?