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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