1. A car travelling along a horizontal road passes a point $A$ with velocity $21{ms}^{-1}$ and constant acceleration $0.2{ms}^{-2}$.

Point $B$ is $1.5km$ from point $A$. When the car reaches point $B$ it decelerates uniformly at $3.1{ms}^{-2}$ until it comes to rest.

Find the distance the car travels from the moment it starts to decelerate until it comes to rest.