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Homework Statement
A squirrel has x and y coordinates (1.1m, 3.4m) at time t1=0.0s and coordinates (5.3m, -0.5m) at time t2=3.0s. For this time interval, find (a) the components of the average velocity, and (b) the magnitude and direction of the average velocity.
Homework Equations
vavg=\Deltax/\Deltat.
The Attempt at a Solution
Xv avg = (5.3m - 1.1m)/(3.0s - 0.0s) = 1.4 m/s
Yv avg = (-0.5m - 3.5m)/(3.0s - 0.0s) = -1.3 m/s
I know these values are correct because I checked them in the back of the book. I don't understand how they get the magnitude and direction of the average velocity.
http://img704.imageshack.us/img704/8484/20240551.png
Here's a picture of the average velocity vectors. The resultant vector (the diagonal line) should be \sqrt{(-1.3 m/s)^2+(1.4m/s)^2}, which is 0.52 m/s. The book says it's 1.9 m/s, which means they made Yv avg a positive 1.3 m/s. Why did they do this?
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