tag:blogger.com,1999:blog-2853830991106309117.post2075887802061308529..comments2023-01-04T07:00:24.940-08:00Comments on Johnny and Mary Do Maths: A Relative Velocity QuestionChris Pattersonhttp://www.blogger.com/profile/06280885648784664003noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-2853830991106309117.post-39502819764160821132011-03-06T05:33:11.071-08:002011-03-06T05:33:11.071-08:00are we gonna learn this?are we gonna learn this?xingyihttp://www.sir-games.comnoreply@blogger.com