A ball is released at the left end of these different tracks. The tracks are bent from equal-length pieces of channel iron.

a. From fastest to slowest, rank the speed of the ball at the right end of the track.
b. From longest to shortest, rank the tracks in terms of the time for the ball to reach the end.
c. From greatest to least, rank the tracks in terms of the average speed of the ball. Or do all balls have the same average speed on all three tracks?

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A