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May 7, 2018 at 17:01 vote accept suiz
Apr 4, 2018 at 7:34 comment added suiz @DJohnM The freight car initially was empty before coming under the hopper. Maybe it's the initial condition.
Apr 3, 2018 at 21:13 comment added DJohnM Note that the question and solution are inconsistent: the sand falls "into" a freight car, but in the solution, it "lands on the surface" of the car...
Apr 3, 2018 at 16:34 answer added Farcher timeline score: 2
Apr 3, 2018 at 16:20 answer added Charles Bretana timeline score: 0
Apr 3, 2018 at 15:51 history edited suiz CC BY-SA 3.0
deleted 23 characters in body
Apr 3, 2018 at 15:33 history asked suiz CC BY-SA 3.0