Khan/khan-exercises — pull request #6969 by gnaget (2011-11-23 16:59:26+00:00)
Title: physics modules

new physics modules, average velocity and solving for time. They line up with the physics videos of the same name

video links:
average velocity: http://www.khanacademy.org/video/calculating-average-velocity-or-speed?playlist=Physics
solving for time: http://www.khanacademy.org/video/solving-for-time?playlist=Physics