$A$ particle is fired straight up from the ground. Its height in feet after $t$ seconds is given by $s(t) = 128t - 16t^2$. The velocity of the particle when it hits the ground is...
- A$-128 \text{ ft/sec}$
- B$128 \text{ ft/sec}$
- C$0 \text{ ft/sec}$
- D$256 \text{ ft/sec}$
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