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Answers for “当速度为非负时,加速度的符号如何影响速率?”

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Acceleration is defined as the second derivative of the position (or displacement) function s(t)s(t) with respect to time tt. It represents the rate of change of velocity, where velocity itself is the first derivative of displacement.

Conditions: Motion occurs along a fixed line with a chosen coordinate direction.; The position function s(t)s(t) is twice differentiable with respect to time.