Car A and car B start moving simultaneously in the same direction along the line joining them. Car A moves with a constant acceleration a=4m/s², while car B moves with a constant velocity v=1m/s. At time t=0, car A is 10m behind car B. Find the time when car A overtake car B.
A. 2.5s
B. 3.5s
C. −2s
D. none