1. http://www.prep101.com/MCAT/102MCATPhysicsAnswers.pdf Numbers 4 7 and 14 2. As you can see the answers are already available, I'm just having trouble trying to get to them. 3. For number 4 I've tried plugging in the k value (8000) and distance (.05) in to get a force value. I'm kind of lost from there as I've tried. Number 7 and 14 are kind of the same. However, for 7 I did get the answer when I plugged I plugged it into a Fc = v/r. So I did in fact get 10m/s but when I ignored the squared sign from the original equation (Fc = v^2/r). If I did do something correct then why did the squared sign disappear? For number 14 I don't really know how to tackle this if I don't have mass. Once again if you can tell me how to reach the answers to one of these questions that would be great.