Uh-Oh!!.....here we go again!

I vote -- 120
Kinda like an escalator. You can still go up on a "down" escalator
if you run. The treadmill would have to be "set" at the 60 mph speed
so that the car's "input" would not affect it. Then you could move
faster "forward" than the treadmill is moving "backwards". You could
also adjust the indicated speed to less than 60 and the conveyor would
carry the car backwards at less than 60. All relative to the world.
Speedometer says 60 - car is standing still.
Speedometer says 120 - car moves forward 60 mph
Speedometer says 0 - car moves backwards 60 mph

The conveyor is just another stationary road in a different reference frame.
Only this time it's not interacting with another frame's stuff (airmass).
The conveyor could be on another planet....or BE another planet.

"cjcampbell" wrote in message
oups.com...

Tony wrote:
176. cjcampbell
Feb 6, 9:41 pm show options

Newsgroups: rec.aviation.student, rec.aviation.piloting
From: "cjcampbell" - Find messages by
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Date: 6 Feb 2006 18:41:35 -0800
Local: Mon, Feb 6 2006 9:41 pm
Subject: Can a Plane on a Treadmill Take Off?
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"cjcampbell" wrote

Okay, I see why the plane moves forward normally no matter how fast the
treadmill is going and even why it would not work in an automobile.

Well, not exactly. This dead horse is fun to beat. Suppose I tell you
the car is going forward at 60 mph. That means the belt is going the
other way at 60, right? The speedometer would be indicating 120.

The OP said the belt is moving backward as fast as the whatever is
moving forward. When you substitute real numbers into the thing it
becomes more clear.

Or not.

Apparently not to everyone. :-)

The speedometer would indicate 60.