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d2tw4all

## Main Question or Discussion Point

I hope there are some physicists here, an argument has been going on for many years between myself and someone else, anybody who has any insight, please answer the following question and you will help to resolve this debate!

A 747 jetliner weighing 163844 kg (the empty weight of a 747) lands on a treadmill that is 500 meters long running in the opposite direction of the plane and doesn't apply any brakes whatsoever, relying only on whatever friction is in the bearings of the wheels to slow it down. The speed the aircraft lands is 200kph, and the speed that the treadmill is moving in the opposite direction of the plane is 200kph. Assume the tires and landing gear withstand the impact, remember, little to no brakes are applied at any time. Also, it's autonomous so there is no margin for pilot/human error, assume it's a "perfect" landing onto the treadmill. WHAT WILL HAPPEN.

Thanks!

Tom Lavoie

A 747 jetliner weighing 163844 kg (the empty weight of a 747) lands on a treadmill that is 500 meters long running in the opposite direction of the plane and doesn't apply any brakes whatsoever, relying only on whatever friction is in the bearings of the wheels to slow it down. The speed the aircraft lands is 200kph, and the speed that the treadmill is moving in the opposite direction of the plane is 200kph. Assume the tires and landing gear withstand the impact, remember, little to no brakes are applied at any time. Also, it's autonomous so there is no margin for pilot/human error, assume it's a "perfect" landing onto the treadmill. WHAT WILL HAPPEN.

Thanks!

Tom Lavoie