An Airbus 380 has constant acceleration of 1 m/s2. Its takeoff velocity is 280 km/h. How long must the runway be at a minimum to allow the plane to take off?
It is interesting to observe that if we used the average speed 700/18 m/s, we would also get the answer because the area under the graph (yellowish green rectangle) is the same as the area of the triangle. This trick works for constant acceleration, but it may not work in other situations.
* GCE ‘O’ Level “Elementary” Mathematics
* GCE ‘O’ Level Physics
* other syllabuses that acceleration, speed and distance
* precocious kids who always want to learn more