An aeroplane flies 400 m due north and then 300 m due south and then flies 1200 m upwards, the net displacement is ?
The net displacement is 1204 m.
The net displacement of the plane will be the shortest distance between its starting point and its finish point.
Let's assume that your plane starts in point
Since north and south are opposite directions, the plane will end up very close to where it started, i.e. point
So, horizontally, the plane only travelled 100 m from its starting point. At this point, its flight path turns upwards.
The plane flies 1200 m upwards to point
This means that the net displacement, which is equal to