How to find displaement, speed and velocity?

[physic geek]

Homework Statement

A car initially traveling to the right at a steady speed of 25m/s for 5.0s applies its brakes and slows down at a constant rate of 5 m/s^2 for 3.0s. It then continues with no additional braking for another 6.0s. B) what is the velocity after 3.0s of braking? C) what was the displacement during the total 14.0s of its motion? D) What was the average speed for 14.0s?

Homework Equations

The Attempt at a Solution

 

[lewando]

Welcome to PF, physic_geek! If you have not read the rules, do check them out. They basically say you need to attempt a solution in order to receive help. Give your problem a try, and post your specific questions.