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displacement?
displacement is the change in position from top of dock to the place it hit. You can figure the vertical distance from the time fallng.
vertical fall=1/2 g t^2 solve for that.
displacemetn^2=verticalfall^2 + horizntaldistance^2
so solve that for horizontaldistance, you know the other two.
now,
speed*.95=horionaldistance
now solve for speed.