Conservation of energy problem.

[the whizz]

Homework Statement

problem is here

http://img151.imageshack.us/img151/1675/question7ql6.th.jpg http://g.imageshack.us/thpix.php

Homework Equations

The Attempt at a Solution

for the #7 part

http://img232.imageshack.us/img232/9079/problem7answerqq9.th.jpg 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://g.imageshack.us/thpix.php

 

[the whizz]

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