Physics
Physics, 16.11.2019 05:31, KayPink5723

Aplank of length l and mass m hangs from an axle passing through one end. the other end is allowed to hang down so that it just brushes a workbench. you place a box of height h and mass m so that it just touches the plank when sitting on the bench. you then raise the plank up, turning around the axle, so that its movable end is a height h above the bench. you let the plank go, it pivots around the axle, and hits the ball elastically. how fast does the box move after the collision if it slides without friction?

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