not much but I remember some. 1. 34J (difference in KE) 2. 0.25m (total distance final answer) 3. 42 degrees ( that centre of mass question) 4. For that ball collisions question, I got 0.8 < f<1 as a final answer. That's all I remember. Cant answer the final 7c question That's really hard. Can't make head or tail of it.