When David rolls it around like this, he's turning the sling around probably at six or seven revolutions per second, and that means that when the rock is released, it's going forward really fast, probably 35 meters per second.
Ketika Daud menggulirnya seperti ini, ia memutar pengumban mungkin sekitar 6 atau 7 putaran per detik, dan itu berarti saat dilepaskan, batu akan melaju ke depan sangat cepat, mungkin 35 meter per detik.