Physics homework help

I have attached HW 1 and 2 along with my answers. With the finals I have next week I have not been able to spend enough time to clarify my answers with detail. I have a pretty strict instructor, so you may edit my answers as you see fit. The HW is not due till May 5th, however a prompt submission would help me a lot in preparing for the final.Only four questions require answers for each HW set. My answer for #6 in HW2 is pretty bad, would appreciate any help.Thanks