(2009? On the horizontal ground of the second model in Jing 'an District, two cars, A and B, start to move in a straight line at the same time, and their s-t images are shown in Figure (a) and Figure

(2009? On the horizontal ground of the second model in Jing 'an District, two cars, A and B, start to move in a straight line at the same time, and their s-t images are shown in Figure (a) and Figure (b) respectively. A, according to the image, the average speed of car A is V A =S A T A =2.4m6s=0.4m/s, and that of car B is V B = S B T B =1.2m12S = 0.1m/s, so the speed of car A is higher than that of car B.

B distance is related to two factors: time and speed. Although the speed of car A is faster than that of car B, it is only on the premise of the same time, so this option is wrong;

C, although the average speed of car A is greater than that of car B, their mass is not considered, so it is impossible to compare their kinetic energy, so this option is wrong;

D. According to the calculation result of A, the average speed of car A is greater than that of car B, so the distance between car A and car B increases with time, so this option is correct.

So choose D.