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April 18, 2014

Homework Help: Physics

Posted by Zoe on Thursday, October 8, 2009 at 12:55pm.

A person walks first at a constant speed of 4.70 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.80 m/s.

(a) What is her average speed over the entire trip?
(b) What is her average velocity over the entire trip?

I thought that I could just take the average of the two speeds in part A but it isn't the answer. I don't know how to solve for it with no distance given for either A or B.

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