A 200 kg roller coaster is initially moving at 4.0 m/s. The ride reaches a maximum height of 35 m and a top speed of 25 m/s. Finally, 40 seconds after starting, the roller coaster comes to rest on a section of track that is 2 m below the starting height. There are no elastic (spring) forces involved. For the whole ride, the work done by all non-conservative forces combined on the roller coaster is 60900 X

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