I am currently in a Grade 12 physics class and I don't understand how to apply the notes I'm given to questions after... hopefully someone can help me figure out how to answer questions from the unit of momentum. I can get the first section with p=m*v I get that but when it gets into 2-dimensional questions and ones that have a recoil velocity I get stuck... If there is anyone out there who can tell me anything to help me try to figure this stuff out would be great! Thanks

You need to remember to treat 2 dimensional problems as sets of one dimensional problems. Try to describe what is happening in each dimension, after that it's easy.

If you need more specific help, please feel free to ask.