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because to open a door torque must be applied and as the distance is 0 it can't be opened.

hope this is what you want , if you like this plss mark as the brainliest!

1 5 1
Unit is Metre itself 
yes poojan i know that
but im sad because moderator works very slow here
Sorry for that... 
it's ok
at least u corrected this :)
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