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when toggle format what by license comment
Jun 2, 2020 at 20:38 comment added Umaxo @NuclearWang I was not talking about ladder as a whole
Jun 2, 2020 at 16:24 comment added Nuclear Hoagie If the ladder is falling, its center of mass is accelerating toward the ground, in which case the net vertical force is nonzero. This can occur whether there is friction or not.
Jun 2, 2020 at 10:07 history answered Umaxo CC BY-SA 4.0