i have a JavaScript version here

http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/01-kinematics/37-kinematics-in-y-direction

select dropdown menu "free fall and rebounce"
[img]https://lh4.googleusercontent.com/-o1a8H9RVMMQ/U0SBSYyWhzI/AAAAAAAAgNg/NcFU1wEkoCU/s640/blogger-image-1827329758.jpg[/img]
enjoy!