The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application.
Physics Tasks Problem Solver. This is the mobile version of Physics-AST software. This program supposed to help high school students to solve physics problems in Kinematics, Mechanics, Thermodynamics and so on.
Simply fill fields with values of given units(initial speed, time, force and so on) and click on Calculate button.
After that you will see parameters which are possibly can be calculated based on given data.
Click on any of them, and several solutions with formulas will be in front of you, that's it. Enjoy.