Posted by babidi on .
A person walks first at a constant speed of 4.50 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 3.00 m/s.
(a) What is her average speed over the entire (b) What is her average velocity over the entire trip?
trip?

physics 
bobpursley,
Let A to B be 100 miles, and B to A be 100 miles.
Distance=200 miles
So what is the time
timeAB=100/4.5 timeBA=100/3
add the times to get total time
average velocity=distance/totaltime
Velocity=displacement/time
= (finalpositioninitialposition)/time