A roller coaster (432 kg) moves from A (9.32 m above the ground) to B

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A roller coaster (432 kg) moves from A (9.32 m above the ground) to B (21.9 m above the ground). Two non-conservative forces are present: friction does -1.42×104 J of work on the car, and a chain mechanism does +5.85×104 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? Number Units

A roller coaster (432 kg) moves from A (9.32 m above the ground) to B (21.9 m above the ground). Two non-conservative forces are present: friction does -1.42×104 J of work on the car, and a chain mechanism does +5.85×104 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? Number Units

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A roller coaster ( 432 kg ) moves from A ( 9.32 m above the ground) to

B

( 21.9 m above the ground). Two non-conservative forces are present: friction does

- 1.42 \times 10^{4} J

of work on the car, and a chain mechanism does

+ 5.85 \times 10^{4} J

of work to help the car up a long climb. What is the change in the car's kinetic energy

K E_{f} - K E_{o}

from

A

to

B

?

Number i Units

◻

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