Imagine there is a piece of sine-shaped rollercoaster track. We compare trains of different length which all have the same average speed riding over the track. If all friction is neglected, is the difference between the maximum and minimum speed:
A. bigger for longer trains
B. smaller for longer trains
C. does not depend on the length of the train
D. depends on the length of the train but not as stated in A or B.
The Attempt at a Solution
My guess was that longer trains would have their wagons distributed more evenly on the track, such that the bumps would have less effect on the average speed. However, the answer is D and I do not understand why?