A ball rolls along a horizontal track in a certain time. If the track has a dip in it, the time to roll the length of the track will be
A)less.
B)the same.
C)more.

Question

Quizplus · Accepted Answer

When a ball rolls along a track with a dip, it gains speed due to the gravitational potential energy converting into kinetic energy as it goes down the dip and loses less time going up because of the gained speed, thus completing the track in less time overall compared to a flat track.

A Ball Rolls Along a Horizontal Track in a Certain