Which formulas do I use to solve these pr

[ProtoFLX]

I have been assigned several physics problems by my professor, but am not sure how to solve them due to my inexperience with physics (computer science major). It would obviously not help me if I asked somebody to solve all of the problems for me, but what I would like to know is what formulas I will need in order to solve problems 2-6. Once I know that, I will attempt to solve the problems myself and perhaps ask if my answers are correct later.

http://puu.sh/p81vf/fae582b13e.jpg

 

[CWatters]

Look up Newton's laws and conservation of momentum. May also need the equations of motion.