## How to solve Momentum and Collisions problems

Choose your frame of reference

Set up a coordinate system and define your velocities with respect to that system.It is usually convenient to have the x axis coincide with one of the initial velocities.

In your sketch of the coordinate system, draw and label all velocity vectors and include all the given information.

Write expressions for the x and y components of the momentum of each object before and after the collision. Remember to include the appropriate signs for the components of the velocity vectors.