The displacement of a particle at time $t$ is $s = t^{3} - 4t^{2} - 5t$. The velocity of the particle at $t = 2 \text{ sec}$ is:
- A$\left(\frac{1}{9}\right) \text{ units/sec}$
- B$-9 \text{ units/sec}$
- C$9 \text{ units/sec}$
- D$\left(-\frac{1}{9}\right) \text{ units/sec}$
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