I hate to do this . . .but I need some help on physics. I have a quiz tomorrow and no one can figure out the last three example problems. It gets even better though, the teacher is gone(damn football) tomorrow so I can't even go in early to ask for help. I worked in a group today to figure out the first 15 problems then we all came home and worked some more, we are still stumped on these last few. Anyway, if any of you are willing to do physics this late or even just point us in the right direction it would be great. http://img144.imageshack.us/my.php?image=img2ne8.jpg I need help with 21, 23, and 25. Any help is appreciated.