15 A 500-kilogram sports car accelerates uniformly from rest, reaching a speed of 30 meters per second in 6 seconds. During the 6 seconds, the car has traveled a distance of
(A) 15 m
(B) 30 m
(C) 60 m
(D) 90 m
(E) 180 m
(A) 15 m
(B) 30 m
(C) 60 m
(D) 90 m
(E) 180 m