Refer to the tracks above.
a. Does ball B roll faster along the lower part of track B than ball A rolls along track A?
b. Is the speed gained by ball B going down the extra dip the same as the speed it loses going up near the right-hand end—and doesn’t this mean that the speed of balls A and B will be the same at the ends of both tracks?
c. On track B, won’t the average speed dipping down and up be greater than the average speed of ball A during the same time?
d. So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to the previous exercise?)
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