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

[riodarra]

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?

 

[radou]

You may want to take a look at http://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Vector_addition.png/467px-Vector_addition.png" .

 

[riodarra]

Thanks, I think I got it.