IF the object's motion is graphed, and IF time is plotted
along the x-axis and the object's position is plotted along
the y-axis, then the slope of the graph at every point is the
object's speed at that instant of time.
The sound absorption for wood is greater than the sound absorption coeffiecient for concrete at most frequencies, hence based on the coefficient of absorption for each material, wood is the best choice.
In 1600 when William Gilbert published De Magnete
