# Homework Help: Found half an answer, I need help with the direction please.

1. Feb 6, 2012

### nesan

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

A projectile is launched with a horizontal velocity of 10 m/s and a vertical velocity of 20 m/s. What is the magnitude and direction of the projectile’s initial velocity?

3. The attempt at a solution

I've tried using the trigonometric method but I end up with only 1 side and 1 angle which isn't good. I could logically think that since one side is 20 and one side is 10, the angle would be

90 / 3 = 30

30 * 2 = 60

But the answer sheet says 63 degrees. :"(

I found the magnitude but the problem is I can't find the direction. More specifically, at what degree is it travelling at.

The magnitude is 22.

So it should be

22 m/s [Up x Horizontal]

x = an unknown angle

I'm having trouble finding the value of x.

Than you. :3

NVM GOT IT. LOL :D

Last edited: Feb 6, 2012
2. Feb 6, 2012

### PeterO

Have you drawn a picture?
If you did you would see a right-angled triangle, and just use the Tangent function.