three objects having the same mass begin at the same height, and all move down the same vertical distance h. one falls straight down, one slides down a frictionless inclined plane, and one swings on the end of of a string.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.