Below is a diagram representing a strobe photograph of two balls
rolling (to the right) parallel to each other along two tracks.
Students are asked to select where the two balls have the same
speed.
Students who suffer from this misconception will answer that the
balls have the same speed at the time of the 4th strobe flash (when
the red ball is directly above the blue ball).
Related misconceptions/student difficulties that may arise in
the question:
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