(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Starting from a pillar, you run a distance 200m east (the x-direction) at an average speed of 5.0m/s , and then run a distance 280m west at an average speed of 4.0m/s to a post.

Calculate your average speed from pillar to post.

Calculate your average velocity from pillar to post.

I drew a rough sketch on how I would this would look like:

http://img365.imageshack.us/img365/449/untitled1zs5.jpg [Broken]

I understand that they are on the sime line, as if the runner is running forward and back,

I drew it in two seperate lines for convienience.

2. Relevant equations

V = X2-X/T2-T1

3. The attempt at a solution

At first, I would assume that on they way back, the speed would be 4.0m/s and would remain that for the 80m portion gap between 200 and 280m.

Then I decided, that was too easy (and plus I got it wrong), so I think the equation shown above comes into play. But I don't know where to go from there, can anyone stir me into the right direction.

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# Homework Help: Calculate your average velocity from pillar to post

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