What is the distance and speed of a car with constant acceleration?

[ScienceGirl90]

Homework Statement

A car is moving at 50.0 m/s and brakes to a halt in 6.00 seconds.
(1)From the time it starts braking, how far does the car travel before the car comes to a halt if its acceleration is constant?
(2)What is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?

Homework Equations

v=a*t+v_o

The Attempt at a Solution

I really just don't where to start with this problem. I'm confused! Please help!

 

[fss]

The equation you listed will get you the acceleration, but for the distance you'll need

$$v_f^2 = v_0^2 + 2ad$$

 

[ScienceGirl90]

Ok thank you! I was able to find the distance for question one but I am still stuck as to what is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?

 

[fss]

Ok thank you! I was able to find the distance for question one but I am still stuck as to what is the car's speed 1.35 s after it starts to brake if the cars acceleration is constant?

Just use the first formula you gave in your original post. Pay attention to your signs and you'll be golden.

 

[ScienceGirl90]

Got it. Thanks!