# Reference framefrom masteringphysics

1. Sep 20, 2005

### xyoonboixkpx

This is the only problem taht i could not figure out for 2 hours...
I even asked one of my friend who got 5 on his ap exam about this problem..he said no no to this question..anybody willin to help?

.Susan, driving north at 60 mph, and Shawn, driving east at 45 mph, are approaching an intersection

Q: What is Shawn's speed relative to Susan's reference frame?

2. Sep 20, 2005

### Staff: Mentor

Try this:
$$\vec{v}_{(Shawn/Susan)} = \vec{v}_{(Shawn/Ground)} + \vec{v}_{(Ground/Susan)} = \vec{v}_{(Shawn/Ground)} - \vec{v}_{(Susan/Ground)}$$

Hint: Write the vectors in component form.

3. Sep 20, 2005

### xyoonboixkpx

thanks for da help

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