Physics questions (multiple choice) HELP!?

I don't want to answer these questions for you. You have to be able to solve these yourself but keep in mind that momentum is m times velocity. For most of these questions you have to m and the velocity so they should be pretty easy to solve, and for the ones where you don't have the m (but you know it stays the same) but you have the velocity and you want to know if the momentum changes and how, you can just plug in a random m (like 50kg) to solve for the momentum.