An automobile vehicle has a mass of 1500 kg. What will be the force between the vehicle and the road if the vehicle is to be stopped with a negative acceleration of $1.7\mathit{ m}/s^2$ ?

Given:
Here, the mass of the automobile, $\mathit{m }= 1500\mathit{ kg}$
Acceleration of the automobile, $\mathit{a }=\mathit{ –}1.7\mathit{ m}/s^2$
Force between the vehicle and the road
         $\mathit{F }=\mathit{ ma}$
         $\mathit{F }= 1500\mathit{ kg }\times (- 1.7\mathit{ m}/s^2)$
         $\mathit{F }=\mathit{ –}2550\mathit{ N }$
(Negative sign indicates that the direction of force is opposite to the motion of the vehicle.)
The friction force between the vehicle and the road is 2550 N.