Question: An object moves along a horizontal coordinate line in such a way that its position at time t is specified by s = t3 -

An object moves along a horizontal coordinate line in such a way that its position at time t is specified by s = t3 - 3t2 - 24t - 6. Here s is measured in centimeters and t in seconds. When is the object slowing down; that is, when is its speed decreasing?

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