[i][b][size=85]for the kids of all the Truro kids of yore![/size][/b][/i][br][br]GREEN and BLUE take turns in their race around the track. At each turn they can either [u][i][b]coast[/b][/i] [/u](i.e. continue with the velocity they have) or change their velocity by administering a [u][i][b]kick[/b][/i][/u] in a direction they choose.[br][br]Getting around a corner is a challenge - and leads to a deep understanding of the vector nature of both velocity and acceleration.