[meteorite-list] Fireball question / sonic boom

[GeoZay at aol.com]

>>Ablation ceases at 3-4 km/s  (about Mach 10), and this is about where the 
meteoroid becomes invisible.  For a typical meteorite, it will rapidly lose 
this remaining velocity and  enter nearly vertical dark flight.<<


Thanks Chris...When math  gets beyond my ten fingers and ten toes, I get 
swamped. :O) 
Not sure if I've  converted it right, but I end up with something like:

3km/s equals 1.76  miles/sec of which that equals about 6336 mph.

again...
4km/s equals  2.35 miles/sec of which that equals about 8460 mph. 

So if I counted on  my toes properly, the point of retardation in mph comes 
to be in the approximate  range of 6336mph to 8460 mph?