$\mathrm{s}$ Is the Distance (In $\mathrm{ft}$ ) Traveled in Time $\mathrm{t}$ (In S) by a Particle

$\mathrm{s}$ is the distance (in $\mathrm{ft}$ ) traveled in time $\mathrm{t}$ (in s) by a particle. Find the velocity and acceleration at the given time.
- $s=\sqrt{t^{2}-5}, t=3$

A) $\mathrm{v}=-\frac{5}{8} \mathrm{ft} / \mathrm{s}, \mathrm{a}=1.5 \mathrm{ft} / \mathrm{s}^{2}$
B) $\mathrm{v}=1.5 \mathrm{ft} / \mathrm{s}, \mathrm{a}=-\frac{5}{8} \mathrm{ft} / \mathrm{s}^{2}$
C) $\mathrm{v}=-1.5 \mathrm{ft} / \mathrm{s}, \mathrm{a}=\frac{5}{8} \mathrm{ft} / \mathrm{s}^{2}$
D) $\mathrm{v}=\frac{5}{8} \mathrm{ft} / \mathrm{s}, \mathrm{a}=-1.5 \mathrm{ft} / \mathrm{s}^{2}$