A-ball-is-bouncing-elastically-with-a-speed-1-m-s-between-walls-of-a-railway-compartment-of-size-10-m-in-a-direction-perpendicular-to-walls-The-train-is-moving-at-a-constant-velocity-of-10-m-s-parall
Question Number 21112 by Tinkutara last updated on 13/Sep/17