Ladder paradox - so confused Watch
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don't really understand the explanation tho'
Just wish I understood....
OK, let us start with the experimental setup. The ladder, in its own rest frame, is 20 m long and the garage in its own rest frame is 10 m long. We arrange for the ladder to travel through the garage at sufficient speed for it to be contracted to be just under 10 m long. We fit the garage with two doors which will close and open simultaneously. For possible future explanation, let us say that we do this by setting up a flashbulb in the centre of the garage and having an optical receiver at each end which controls the doors. In the reference frame of the garage, the ladder is contracted to 10m so that just as it is passing through the garage we briefly simultaneously close both doors whilst the ladder is inside the garage then open them again before the ladder hits them. OK so far?