KECalc is a Kinetic Energy Calculator extended to calculate any of energy, velocity or mass given values for the other two. The functionality of this Android app is identical to that of the Linux, MacOS and Windows desktop versions (https://gpc.fotosoft.co.uk) but simplified and rearranged to better suit mobile devices.
V1.1.4 has the down-range energy calculations as per the desktop versions and includes facilities to display - and email - both the graphs and the table.