A truck has an initial speed of 20 m s–1. It decelerates at 4.0 m s–2. What is the distance taken by the truck to stop?

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.