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For a car to move smoothly along a track, the height function must be differentiable and:

AContentious
BContractual
CContinuous
DContiguous
Answer & Solution
Correct answer: C. Continuous
1. A jump would throw the car off. 2. A corner would jolt it. 3. So it must be continuous as well. _Source: OpenStax Calculus Volume 1, Chapter 3, Derivatives._
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