# Finding vector magnitude?

1. Sep 18, 2014

### needsphysics

1. The problem statement, all variables and given/known data

Vx = 18 m/s and Vy = 45 m/s

2. Relevant equations

This is what I am not understanding, could anyone help with the equation process to finding the magnitude?

Thank you!

2. Sep 18, 2014

### cwasdqwe

Do we know if the movement takes place in 2 or in 3 dimensions?

3. Sep 18, 2014

### nrqed

It does not matter.

To the OP: what is the formula for the magnitude of a vector if we know all its components? You must have seen this somewhere...

4. Sep 18, 2014

### cwasdqwe

To define all its components you must know the dimension... but okay, let's assume $v_{z}=0$...

5. Sep 18, 2014

### nrqed

Yes, I assume that $v_z =0$ since no value is provided. It would be strange if $v_z$ was not zero and they would not give us the value. My point is that then we get the same answer whether we use the magnitude equation in 2D or in 3D.

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