That's pretty much dependent on your strength and your pedalling skills. You are the motor, your ability is what decides how fast the bike is.
If the rider is immensely strong, the fastest gear is when you have the chain on a big chainwheel in front, and on a small sprocket at the rear.
But for someone of normal strength, the fastest gear is one where you're strong enough to keep turning the cranks at about 100 turns/minute.
it can probably go about 100 miles per hour and it depends about the gears how much gears it has
Depends on how fast you pedal. As it is a single gear bike. BMX bikes are made that way because if crashed, the bike would be 10 times harder to fix.
it depends on how on how fast you petal and how fit you are
Not particularly, 10 mph is below average sprinting speed. The record speed on a mountain bike is above 100mph.
If you pedal very fast then you may lose control
my mongoose goes to 900-1000 mph
As fast as you can pedal.
A mongoose's top speed is approximately 36 mph.
Depends on if it's twist shift or trigger shift. With twist shif, if you're pedalling just right, maybe 1/2 second to go from one end to the other. Trigger shift, maybe one second.
As fast as you can pedal.
the mongoose it seems is the only animal that does not get killed because its to fast
about 60 k/h but if you want more speed you can probably add some bike gears.