Concept explainers
Refer to the tracks in Exercise 107.
(a) Does ball B roll faster along the lower part of track B than ball A rolls along the straighter 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 speeds 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 Exercise 107?)
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