A Question Of Time - Answer

A Question Of Time - Answer = B

Answer: The correct answer is B. The second marble does reach the bottom in less time. (One can solve both cases using the motion equations for constant acceleration and determine the second time is shortest.) This shows that the shortest distance between two points is not always the fastest as far as kinematics is concerned. There is a least time path for each case which does not normally correspond to the least distance path (except in the case of light - which always travels with the same velocity regardless of path. So for light the least distance path is also the least time path.)

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