Posted by **mattie** on Tuesday, August 31, 2010 at 11:11pm.

A person walks first at a constant speed of 4.90 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 2.70 m/s.

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

- physics -
**karla**, Wednesday, September 1, 2010 at 12:08am
She is travelling the same distance at each speed, so it doesn't matter what that distance is. You simply find the average of the two speeds.

- physics -
**drwls**, Wednesday, September 1, 2010 at 1:51am
The answer is NOT the average of 2.7 and 4.9. I answered this question earlier. Why are you posting it again?

http://www.jiskha.com/display.cgi?id=1283304487

- physics -
**Anonymous**, Wednesday, September 26, 2012 at 9:40pm
Vectors and have equal magnitudes of 49.0. If the sum of and is the vector 16.3 , determine the angle between and .

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