To make this easy and reliable you basicly want to line up ontop of the the person sparrow flying above on your radar. Looking up when lining up correctly helps.
E=mgh
E=(mv^2)/2
Potential Energy (Ep) gets converted to Kenetic Energy (Ek) when Sparrow hits Person: mgh=mv^2/2
Exit speed is: √2gh=v
v= Pritty f*cking fast
![](https://i.ytimg.com/vi/rmJ7FnU2Ikw/maxresdefault.jpg)