4. Car A is standing at red traffic light. Just as the light turns green car B travelling at a constant velocity of 14 m. s- passes car A, which accelerates uniformly at 2.5 ms-2 to a velocity of 18 m. s-1 and then
travels at a constant velocity.

4.2 How long does it take car A to reach a velocity of 18 m. s-1

4.3 Which car is ahead and by how much, when car A reaches a velocity of 18 m. s-1

4.4 How long does it take for the cars to draw level?
​

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.