A 200 kg roller coaster starts from rest. The ride reaches a maximum height of 30, In and a top speed of 30 m/s. 40 seconds after starting, the roller coaster is on a horizontal section of track at the same height as the mm, but now moves at 4 m/s. There are no e1astic(spring) forces involved. How much Midi was done on the roller coaster during this period by all of the neoconservative forces combined?

a) 5600 J

b) 4600 J

c) 3600 J

d) 2600 J

e) 1600 J