Vector Components Homework: Find Vz & Length

[FAJISTE]

Homework Statement

The components of a vector V are often written (Vx, Vy, Vz). What is the z component of a vector which is the sum of the two vectors, V1 and V2, whose components are (2.61, 1.72, 0.00) and (3.84, -4.54, -1.90)?

b) Calculate the length of this vector.

Homework Equations

The Attempt at a Solution

Okay so for part A, I got -1.90 (vz1 + vz2) and that is correct.

Part B? I don't understand how to do it.

Thanks for the help!

 

[PhanthomJay]

For part B, think about Pythagorus...in 3D.

 

[FAJISTE]

Got it.. Thanks!