Depends on the aircraft, can be anywhere from 40 to 160 mph.
to gain speed for take off
About 160 Knots
each plane has a set take off speed , flap position and weight for take off
It then produces lift due to wing configuration and can take off
It can be anywhere between 80 and 140 knots depending on aircraft
he engine is accelerared and the airplane moves down the runway gaining sped. When speed is high enough, 'lift' is created around the wings and it lifts off the ground.
If conditions (airport layout and traffic conditions) allow aircraft take off and land against the wind (headwind). This way the aircraft can take off or approach the runway at a lower ground speed.
This varies greatly from airplane to airplane, as well as according to ground wind conditions. Keep in mind that landspeed does not matter to an airplane nearly as much as AIRspeed. For example, your typical 4-seater single engine airplane takes off at around 60mph airspeed. Given a 20mph headwind, this aircraft could take off at 40mph GROUND speed. If you are interested in how fast the ground is wizzing by when youre looking out the window of the airliner. Most airliners take off at around 150 to 180 mph AIRspeed.
It would depend on altitude of runway, strength of headwind, all-up weight, but think about 180mph.
It depends on the airplane. A Boeing 747 needs to go 160 knots before you can take off in it; a Cessna 172 needs to go 55 knots to take off.
It was not an airplane, and thus could not take off.
Depends on the airplane. Every aircraft has different specific guidelines for altitude, velocity, max wind speed and weight, as well as many other limitations.