Car X moves at a constant speed $u$ along a straight section of road. When $t = 0$, a second car Y is $d_0$ behind car X and is moving in the same direction at speed $v$. The speed $v$ is smaller than the speed $u$. At $t = 0$, car Y starts to accelerate at a constant rate. Car Y passes car X at $t = T$. Which graph would most suitably represent how the distance $d$ between the cars changes with time $t$?
Physics 9702 · AS & A Level · Equations of motion