Homework Help: 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!)