How Do You Solve for V2 in a Vector Acceleration Problem?

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To solve for V2 in the vector acceleration problem, the equation V2 = delta velocity + V1 is used. The V1 vector is represented as 3 cm at an 80-degree angle, while the change in velocity is 5.1 cm downward at 90 degrees. The vectors have been drawn together on a diagram, but further steps are needed to calculate V2. The scale provided indicates that 1 cm equals 1 km. Clarification on the next steps for vector addition is requested.
riodarra
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I'm having trouble with finding V2 using the vector diagram I'm given.
I know the equtaion I have to use is V2 = delta velocity + V1

Here's a description of the diagram.
I have the V1 vector going up 3cm at an 80 degree angle. The change in velocity is 5.1cm down at 90 degrees. And the scale I'm given is 1cm = 1km.

I drew the two vectors togther on one diagram, but I don't know what to do next. Can someone help me please?
 
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You may want to take a look at http://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Vector_addition.png/467px-Vector_addition.png" .
 
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Thanks, I think I got it.
 
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