At a particle has velocity and acceleration

MATHEMATICS · Subjective · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation

Problem

At t=3 st=3\text{ s} a particle has velocity −4 ft/s-4\text{ ft/s} and acceleration −1 ft/s2-1\text{ ft/s}^2. State whether the particle’s speed is increasing or decreasing at that instant and justify your answer in one sentence.

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