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Acceleration is defined as the second derivative of the position (or displacement) function $s(t)$ with respect to time $t$. 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 $s(t)$ is twice differentiable with respect to time.

Acceleration is defined as the second derivative of the position (or displacement) function $s(t)$ with respect to time $t$. 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 $s(t)$ is twice differentiable with respect to time.