Collision Carts Simulator for Android and iOS

Just refined the Collision Carts Simulator for Android and iOS

http://iwant2study.org/ospsg/index.php/46
https://play.google.com/store/apps/details?id=com.ionicframework.collisioncartapp170147

http://iwant2study.org/ospsg/index.php/46
https://itunes.apple.com/us/app/collision-carts-simulator/id1177377945?mt=8

enjoy!