Uniform Acceleration-Algebraically

[alit00]

b]1. Homework Statement [/b]

An object was displaced 19.6 m east while uniformly accelerating from rest. If the average velocity of the object was 5.00 m/s east, what was the rate of acceleration?

Homework Equations

The Attempt at a Solution

So my Vo=0
Vf= 5.00m/s east
x=19.6m

I need to calculate acceleration. Which equation do I use and how would I manipulate it?

 

[gneill]

What is the definition of average velocity? Can you extract a time from this definition and the given information?

If you know the time and the distance traveled, do you know of a kinematic equation that relates them to the acceleration?

 

[alit00]

What is the definition of average velocity? Can you extract a time from this definition and the given information?

If you know the time and the distance traveled, do you know of a kinematic equation that relates them to the acceleration?

I don't believe I can extract a time from the problem. I tried using Vf^2 = V0^2 + 2ax. I do not know how to isolate the a. Can you help? My average velocity is my final velocity in this problem, is that correct?

 

[gneill]

I don't believe I can extract a time from the problem. I tried using Vf^2 = V0^2 + 2ax. I do not know how to isolate the a. Can you help? My average velocity is my final velocity in this problem, is that correct?

You can extract a time. Go back to your notes and find the definition of average velocity.

 

[alit00]

You can extract a time. Go back to your notes and find the definition of average velocity.

Average velocity is displacement/time. Would my time be 3.92s?

 

[gneill]

Average velocity is displacement/time. I do not have a time in this case.

You have the average velocity and you have the displacement...

 

[alit00]

You have the average velocity and you have the displacement...

I still do not understand. I tried every equation and am not getting the answer

 

[gneill]

I still do not understand. I tried every equation and am not getting the answer

Look at the definition for average velocity. Can you identify the time variable in the definition?
Isolate the time variable in the equation.