Special Relativity: Doppler Effect?

mintsnapple
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Homework Statement


f4i45x.png

Homework Equations



Shown below

The Attempt at a Solution


j7yur8.png


I know I probably did something wrong...but what?
 
on Phys.org
Solving for v went wrong. As you did not provide steps of this, I cannot tell what exactly.
 
Ahhhh! I subtracted by 550 by accident. However, is my procedure correct?
 
b6ekaf.png

How does this look?
 
Looks good.
Certainly the fine for the red light would have been cheaper.
 

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