conservation of energy problem.

[the whizz]

1. The problem statement, all variables and given/known data

problem is here

http://img151.imageshack.us/img151/1675/question7ql6.th.jpg (http://img151.imageshack.us/my.php?image=question7ql6.jpg)http://img151.imageshack.us/images/thpix.gif (http://g.imageshack.us/thpix.php)

2. Relevant equations



3. The attempt at a solution
for the #7 part

http://img232.imageshack.us/img232/9079/problem7answerqq9.th.jpg (http://img232.imageshack.us/my.php?image=problem7answerqq9.jpg)http://img232.imageshack.us/images/thpix.gif (http://g.imageshack.us/thpix.php)

and for #8 here is where i wasnt too sure i was on the right track.

http://img222.imageshack.us/img222/1459/problem8answerth8.th.jpg (http://img222.imageshack.us/my.php?image=problem8answerth8.jpg)http://img222.imageshack.us/images/thpix.gif (http://g.imageshack.us/thpix.php)

[the whizz]

due tomorrow...going to bed would like to see if im on the right track.