![Bird impacting on an airliner Bird impacting on an airliner](/media/stories/problems/classicalmechanics/xairliner_bird001.gif.pagespeed.ic.qncpA6zl38.png)
The change in velocity of the bird is estimated to be 260 m/s
These assumptions made for above estimation:
Head on collision
Bird is riding with the airliner after the collision
Bird’s velocity is negligible compared to that of the airliner
Total time taken to crush the bird (estimated impact time) = Length of the bird / Speed of the airliner
![estimated impact time estimated impact time](/media/stories/problems/classicalmechanics/xairliner_bird002.gif.pagespeed.ic._PgHjuaA2x.png)
Δt = 7.69 x 10-4 sec
Impulsive applied to the bird
![impulse impulse](/media/stories/problems/classicalmechanics/airliner_bird003.gif.pagespeed.ce.-PKxjVfXyf.gif)
![impulse impulse](/media/stories/problems/classicalmechanics/airliner_bird004.gif.pagespeed.ce.HpHpcPq1zD.gif)
![impulsive force impulsive force](/media/stories/problems/classicalmechanics/airliner_bird005.gif.pagespeed.ce.08jQxO74PK.gif)
![impulsive force impulsive force](/media/stories/problems/classicalmechanics/airliner_bird006.gif.pagespeed.ce.hAe9Snt_xn.gif)
![impulsive force impulsive force](/media/stories/problems/classicalmechanics/xairliner_bird007.gif.pagespeed.ic.40VJ3O1EKa.png)
![impulsive force impulsive force](/media/stories/problems/classicalmechanics/airliner_bird008.gif.pagespeed.ce.6sWF-kgqHY.gif)
Average impact force between airliner and the bird is 1.0143 x 105 Ns-1