Find the Slope of the Curve at the Indicated Point $X$

Multiple Choice

Find the slope of the curve at the indicated point.
-The equation for free fall at the surface of Planet $X$ is s $= 12.05 t ^ { 2 } \mathrm {~m}$ with $\mathrm { t }$ in seconds. Assume a rock is dropped from the top of a $600 \mathrm {~m}$ cliff. Find the speed of the rock at $t = 2 \mathrm { sec }$ .

A) $49.2 \mathrm {~m} / \mathrm { sec }$
B) $24.1 \mathrm {~m} / \mathrm { sec }$
C) $48.2 \mathrm {~m} / \mathrm { sec }$
D) $23.1 \mathrm {~m} / \mathrm { sec }$