An antelope trots through the grasslands at a velocity of 1 m/s. Suddenly, a lion begins to chase the antelope. If the antelope accelerates at a rate of 2 m/s2, what is the antelope's final velocity after 7 seconds? Assume that the antelope moves in only one direction.
A.
14 m/s
B.
15 m/s
C.
-13 m/s
D.
13 m/s

PLEASE