# Momentum and Angles

1. Nov 16, 2009

### SuperCass

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

A golf ball of mass 0.045 kg is moving in the +x-direction with a speed of 6.10 m/s, and a baseball of mass 0.145 kg is moving in the -y-direction with a speed of 2.20 m/s. What are the magnitude and direction of the total momentum of the system consisting of the two balls?

_________kg·m/s

_________° (from the +x axis)

2. Relevant equations

P=mv and I'm not sure what else...

3. The attempt at a solution

My teacher said that we should be able to teach ourselves momentum, so as one might be able to tell, I'm not sure where to start.
I tried doing (.045x6.1) + (.145x2.2) = P, but that didn't work. How should I start? Are there other equations I should know?

Thank you so much for your help!

Last edited: Nov 16, 2009
2. Nov 16, 2009

### BAnders1

Did you learn about center of mass? I'm sure your textbook probably has a section on it. The momentum of the system is the same as the momentum of the center of mass of the system.

3. Nov 17, 2009

### Redbelly98

Staff Emeritus
Momentum is a vector, with the same direction as the velocity of the object. You need to add the two momenta as vectors; don't simply add (.045x6.1)+(.145x2.2).

4. Nov 18, 2009

### SuperCass

I just solved it, thank you everyone!

(I did pythagorean theorum and for the angle I just did tangent!)