Q: Two balls rolled down two identical inclined planes. The balls were exactly the same mass and size, but one ball rolled down the inclined plane faster. Identify a possible reason that one ball rolled faster than the other ball.
What is the correct answer to this question?
Options: (A). One ball was red and the other ball was blue.; (B). One ball was new and the other ball was old.; (C). One ball was shiny and the other ball was dull.; (D). One ball was sticky and the other ball was smooth.;...A:
(D).