Concept explainers
Two balls, A and B, are released simultaneously from rest at the left end of the equal-length tracks, as shown.
(a) Which ball will reach the end of its track first?
(b) Does ball B roll faster along the lower part of track B than ball A rolls along track A?
(c) 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? Does this mean that the speeds of balls A and B will be the same at the ends of the tracks?
(d) So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to (a)?
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