1. The problem statement, all variables and given/known data At t = 0, one toy car is set rolling on a straight track with initial position 16.0 cm, initial velocity -3 cm/s, and constant acceleration 2.90 cm/s2. At the same moment, another toy car is set rolling on an adjacent track with initial position 10.5 cm, an initial velocity of 6.30 cm/s, and constant zero acceleration. (a) At what time, if any, do the two cars have equal speeds? 3. The attempt at a solution My answer is 1.1379s by using the method below, Vf = Vi +at 6.3 = 3 + (2.9)t t = 1.1379s However, the answer is 3.21s, with the equal speeds as 12.309cm/s(I suppose by using Vf = Vi +at). I don't understand why the final common speed is not 6.30 cm/s since the one of the object(with initial velocity of 6.30 cm/s) is moving under zero acceleration. Shouldn't it moves under a constant velocity throughout the whole journey?