# Question About AP Physics B Scoring

1. Mar 14, 2010

### GreenPrint

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

I was doing d and had a question because I believe my response is perfectly acceptable but yet it does not reflect the scoring guidelines at all. By the way I believe this is free response #2 on the 2006 Form B AP Physics B test

http://img692.imageshack.us/img692/2172/problemf.jpg [Broken]

2. Relevant equations

I answered using the coefficient of restitution. I use it all the time when I'm asked for the type of collision
http://img709.imageshack.us/img709/995/coefficentofrestitution.jpg [Broken]
click on link and zoom in once to read what the coefficient of resitution is if you do not know what it is

3. The attempt at a solution

Here's my response
http://img688.imageshack.us/img688/4104/myresponse.jpg [Broken]

Here's the scoring guidelines
http://img706.imageshack.us/img706/5879/scoringm.jpg [Broken]

so my question is how would my response be scored? My response is not wrong at all it is as AP would put it "Alternate Solution" as I often see on scoring guidelines. I do not if AP likes people using e when responding to problems of momentum but it's a perfect valid solution...

so what do you think??? how would my response be scored?

Last edited by a moderator: May 4, 2017
2. Mar 14, 2010

### xcvxcvvc

I'd guess you would get full credit, but when I took AP physics C, my teacher never went over that mumbojumbo e. I'd use the more natural and understandable explanation involving kinetic energy.

3. Mar 14, 2010

### ideasrule

Part of your answer does not make sense. What does "the bodies did not stick together" have to do with anything? If the coefficient of restitution is less than 1, that means the collision is inelastic. That's it. No ifs, ands, or buts.

4. Mar 14, 2010

### GreenPrint

ohhhh really thanks i didn't know that