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Is this a question about _speed_ ... or is it a question
about the meaning of _constant_ and its relationship to
_initial_ / _final_?
What was the rationale the students gave who chose "C"?
I
wonder if the answers would be different if the question were
reframed with a familiar context. "A car has an initial speed
of 30 mph and a final speed of 60 mph". Same thoughts
vis-a-vis the question posed later. Is the use of a vague
and/or context confounding the results?